When 1.0 kg of nitroglycerin explodes, it produces approximately 7.52 moles of gas, occupying a volume of about 180.32 liters at 1 atm and 25°C, with partial pressures of 0.41 atm for CO₂, 0.34 atm for H₂O, 0.21 atm for N₂, and 0.03 atm for O₂ at a total pressure of 1.0 atm.
To calculate the moles of gas produced, we need to use the stoichiometry of the balanced equation. From the given equation, we can see that 4 moles of C₂H₅N₃O₃ produce 12 moles of CO₂, 10 moles of H₂O, 6 moles of N₂, and 1 mole of O₂.
Mass of nitroglycerin = 1.0 kg
Molar mass of nitroglycerin (C₃H₅N₃O₉) = 227.09 g/mol
Number of moles of nitroglycerin:
n = mass / molar mass = (1000 g) / (227.09 g/mol) ≈ 4.40 moles
From the balanced equation, 4 moles of nitroglycerin produce 12 moles of CO₂, 10 moles of H₂O, 6 moles of N₂, and 1 mole of O₂. Therefore, the total moles of gas produced will be:
12 moles (CO₂) + 10 moles (H₂O) + 6 moles (N₂) + 1 mole (O₂) = 29 moles
To calculate the volume of gases at 1 atm and 25°C, we can use the ideal gas law:
PV = nRT
V = (nRT) / P
Total pressure, P = 1 atm
Temperature, T = 25°C = 298 K
Universal gas constant, R = 0.0821 L·atm/(mol·K)
Total moles of gas produced, n = 29 moles
Plugging the values into the equation, we get:
V = (29 mol * 0.0821 L·atm/(mol·K) * 298 K) / 1 atm ≈ 180.32 liters
Lastly, to determine the partial pressures of each gas at a total pressure of 1.0 atm, we need to consider the mole ratios of the gases. Since we have 29 moles of gas in total, the partial pressures will be proportional to the mole ratios of each gas. Therefore, we can say that the partial pressures will be as follows:
CO₂: (12 moles / 29 moles) * 1 atm ≈ 0.41 atm
H₂O: (10 moles / 29 moles) * 1 atm ≈ 0.34 atm
N₂: (6 moles / 29 moles) * 1 atm ≈ 0.21 atm
O₂: (1 mole / 29 moles) * 1 atm ≈ 0.03 atm
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What is the equilibrium constant for a reaction at temperature 51.2 °C if the equilibrium constant at 20.9 °C is 30.8? Express your answer to at least two significant figures. For this reaction, ΔrH° = -10.4 kJ mol-1 . Remember: if you want to express an answer in scientific notation, use the letter "E". For example "4.32 x 104" should be entered as "4.32E4".
Using the van 't Hoff equation, we find that the equilibrium constant (K₂) for the reaction at a temperature of 51.2 °C is approximately 20.76.
The van 't Hoff equation is :
ln(K₂/K₁) = ΔrH°/R * (1/T₁ - 1/T₂)K₁ = 30.8 (equilibrium constant at 20.9 °C)
ΔrH° = -10.4 kJ/mol
R = 8.314 J/(mol·K)
T₁ = 20.9 °C = 294.05 K
T₂ = 51.2 °C = 324.35 K
Plugging in the values into the equation:
ln(K₂/30.8) = (-10.4E3 J/mol) / (8.314 J/(mol·K)) * (1/294.05 K - 1/324.35 K)Simplifying:
ln(K₂/30.8) = -1.249E3 * (0.003402 K⁻¹ - 0.003084 K⁻¹)ln(K₂/30.8) = -1.249E3 * (0.000318 K⁻¹)ln(K₂/30.8) = -0.3973Now, solving for K₂:
K₂/30.8 = e^(-0.3973)K₂ = 30.8 * e^(-0.3973)Calculating this expression:
K₂ ≈ 30.8 * 0.6728K₂ ≈ 20.76Therefore, the equilibrium constant (K₂) for the reaction at a temperature of 51.2 °C is approximately 20.76.
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For the reaction 2CO(g) => C(s) + CO2(g), Keq = 7.7 x 10-15. At a particular time, the following concentrations are measured: [CO] = 0.034M [CO2]=3.6x10¹7 M. Is this reaction at equilibrium? If not which direction will the reaction proceed?
The reaction 2CO(g) => C(s) + CO2(g) is not at equilibrium based on the measured concentrations of [CO] = 0.034 M and [CO2] = 3.6 × 10¹⁷ M. The reaction will proceed in the forward direction to reach equilibrium.
To determine if a reaction is at equilibrium, we compare the measured concentrations of the reactants and products with the equilibrium constant (Keq) for the reaction. The equilibrium constant is defined as the ratio of the concentrations of products to reactants, with each concentration raised to the power of its stoichiometric coefficient.
For the given reaction 2CO(g) => C(s) + CO2(g), the equilibrium constant is Keq = [C][CO2] / [CO]², where [C], [CO2], and [CO] represent the concentrations of carbon (C), carbon dioxide (CO2), and carbon monoxide (CO), respectively.
Given the measured concentrations of [CO] = 0.034 M and [CO2] = 3.6 × 10¹⁷ M, we can substitute these values into the equilibrium constant expression. However, since the concentration of carbon (C) is not given, we cannot directly determine the equilibrium constant.
However, we can make an assumption based on the given equilibrium constant value of Keq = 7.7 × 10⁻¹⁵. Since this Keq value is extremely small, it indicates that the forward reaction is highly unfavorable. Therefore, the reaction will proceed in the forward direction to reach equilibrium by consuming CO (carbon monoxide) and producing more C (carbon) and CO2 (carbon dioxide).
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In the laboratory, a student dilutes \( 14.4 \mathrm{~mL} \) of a \( 6.92 \mathrm{M} \) hydroiodic acid solution to a total volume of \( 100.0 \mathrm{~mL} \). What is the concentration of the diluted
The concentration of the diluted solution is approximately 0.9936 M. To prepare 3.50 L of 0.700 M HNO₃, approximately 287.5 mL of the 8.53 M nitric acid solution should be used.
To calculate the concentration of the diluted solution, we can use the formula:
M₁V₁ = M₂V₂
Where:
M₁ = initial concentration of the solution
V₁ = initial volume of the solution
M₂ = final concentration of the solution
V₂ = final volume of the solution
Let's calculate the final concentration (M₂) of the diluted solution:
M₁V₁ = M₂V₂
(6.92 M)(14.4 mL) = M₂(100.0 mL)
M₂ = (6.92 M)(14.4 mL) / (100.0 mL)
M₂ ≈ 0.9936 M
Therefore, the concentration of the diluted solution is approximately 0.9936 M.
Now, let's calculate the volume of 8.53 M nitric acid solution needed to prepare 3.50 L of 0.700 M HNO₃:
M₁V₁ = M₂V
(8.53 M)(V₁ mL) = (0.700 M)(3500 mL)
V₁ = (0.700 M)(3500 mL) / (8.53 M)
V₁ ≈ 287.5 mL
Therefore, approximately 287.5 mL of the 8.53 M nitric acid solution should be used to prepare 3.50 L of 0.700 M HNO₃.
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Complete question :
In the laboratory, a student dilutes 14.4 mL of a 6.92M hydroiodic acid solution to a total volume of 100.0 mL. What is the concentration of the diluted solution? Concentration = M How many milliliters of 8.53M nitric acid solution should be used to prepare 3.50 L of 0.700M HNO
3? mL
A precipitate forms when a solution of lead (il) chloride is mixed with a solution of sodium hydroxide. Write the "net ionic" equation describing this chemical reaction.
The net ionic equation for the reaction between lead (II) chloride (PbCl₂) and sodium hydroxide (NaOH) can be written as follows:
Pb²⁺ (aq) + 2OH⁻ (aq) -> Pb(OH)₂ (s)
In this reaction, the lead (II) cation (Pb²⁺) from PbCl₂ combines with hydroxide ions (OH⁻) from NaOH to form a precipitate of lead (II) hydroxide (Pb(OH)₂).
The net ionic equation represents the species that directly participate in the reaction, excluding spectator ions (ions that do not undergo a change in the reaction).
It's important to note that the balanced complete ionic equation for this reaction would include the dissociation of PbCl₂ and NaOH into their respective ions, but the net ionic equation focuses only on the species involved in the actual chemical change.
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50mL of 0.2M potassium sulfide is mixed with 30mL of 0.3M
potassium carbonate and 40mL of 0.1M ammonium sulfide.
Calculate the final concentration of sulfide ions in the
solution.
The final concentration of sulfide ions in the solution is 0.134 M.
To calculate the final concentration of sulfide ions, we need to consider the principle of conservation of mass and assume that the volumes of the solutions are additive.
First, we calculate the moles of potassium sulfide, potassium carbonate, and ammonium sulfide used:
Moles of potassium sulfide = (50 mL) * (0.2 mol/L) = 10 mmol
Moles of potassium carbonate = (30 mL) * (0.3 mol/L) = 9 mmol
Moles of ammonium sulfide = (40 mL) * (0.1 mol/L) = 4 mmol
Next, we determine the limiting reagent, which is the reactant that produces the smallest number of moles of sulfide ions. In this case, ammonium sulfide is the limiting reagent since it produces 1 mole of sulfide ions per mole of ammonium sulfide.
Since 4 mmol of ammonium sulfide react to form 4 mmol of sulfide ions, and the total volume of the solution is (50 mL + 30 mL + 40 mL) = 120 mL = 0.12 L, the final concentration of sulfide ions is 4 mmol / 0.12 L = 0.134 M.
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List the symmetry elements for the following species \( \square \) Benzene \( \mathrm{PtCl}_{4} \) hydrogen cyanide CHBrClF phosphorus pentachloride Thionyl chloride
Benzene: C₆ rotation axis, σv and σd planes, center of inversion (i); PtCl₄: C₄ rotation axis, σv planes, center of inversion (i); HCN: σv plane, center of inversion (i); CHBrClF: σh and σv planes, C₂ rotation axis, center of inversion (i); PCl₅: C₃ rotation axis, σv planes, center of inversion (i); SOCl₂: C₂ rotation axis, σv plane, center of inversion (i).
The symmetry elements for the given species are as follows:
1. Benzene (C₆H₆):
- C₆ rotation axis (6-fold rotational symmetry)
- Six σv planes (vertical mirror planes)
- Six σd planes (diagonal mirror planes)
- A center of inversion (i)
2. Platinum tetrachloride (PtCl₄):
- C₄ rotation axis (4-fold rotational symmetry)
- Four σv planes (vertical mirror planes)
- A center of inversion (i)
3. Hydrogen cyanide (HCN):
- A σv plane (vertical mirror plane)
- A center of inversion (i)
4. CHBrClF:
- A σh plane (horizontal mirror plane)
- A σv plane (vertical mirror plane)
- A C₂ rotation axis (2-fold rotational symmetry)
- A center of inversion (i)
5. Phosphorus pentachloride (PCl₅):
- C₃ rotation axis (3-fold rotational symmetry)
- Three σv planes (vertical mirror planes)
- A center of inversion (i)
6. Thionyl chloride (SOCl₂):
- A C₂ rotation axis (2-fold rotational symmetry)
- A σv plane (vertical mirror plane)
- A center of inversion (i)
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why
are anti bumping granules added to distilation mixture when making
ester
Anti-bumping granules are added to a distillation mixture when making esters to prevent vigorous boiling and the formation of large bubbles that can cause bumping and splattering during the distillation process.
When esters are synthesized through the reaction of a carboxylic acid and an alcohol, the reaction mixture often contains impurities and by-products that can lead to uneven boiling and the formation of large bubbles during distillation. These bubbles can rise rapidly to the surface and cause the contents of the flask to "bump" or splatter, leading to loss of product and potential safety hazards.
Anti-bumping granules, also known as boiling stones or boiling chips, are added to the distillation mixture to provide nucleation sites for bubble formation. These granules have a rough surface that helps to release small bubbles of vapor in a controlled manner.
By doing so, they prevent the formation of large, unstable bubbles and allow for more even and controlled boiling. This helps to ensure a smooth distillation process, minimize the risk of bumping, and improve the separation and collection of the desired ester product.
In summary, the addition of anti-bumping granules to the distillation mixture when making esters helps to promote smooth boiling, prevent bumping, and enhance the overall efficiency and safety of the distillation process.
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5. Compare the order of migration of a small ( \( 10 \mathrm{kDa}) \) and large \( (80 \mathrm{kDa}) \) protein through a sizeexclusion column (Sephadex G-50) and an 8\% SDS-polyacrylamide gel.
When comparing the order of migration of proteins through a size-exclusion column (Sephadex G-50) and an SDS-polyacrylamide gel, the general trend is that smaller proteins migrate faster than larger proteins.
In a size-exclusion column, the separation is based on the size of the protein. Smaller proteins have a higher chance of entering the pores of the column matrix and therefore experience a greater delay in elution. This results in larger proteins eluting earlier than smaller proteins.
In an SDS-polyacrylamide gel, the separation is based on both size and charge. The proteins are denatured and coated with SDS, which imparts a negative charge and masks the protein's original charge.
During electrophoresis, the proteins migrate through the gel based mainly on their size. Smaller proteins can move more easily through the gel matrix and thus migrate faster than larger proteins.
Therefore, in both the size-exclusion column and SDS-polyacrylamide gel, the small protein (10 kDa) is expected to migrate faster than the large protein (80 kDa).
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What would be the expected absorbarnce value for the 1.50×10 −4
M caffeine solution? The miolar absorptivity ot catteine is 9.80×10 3
? L(molem). Molecular Weight of Caffeine =194.2 g/mol, Select one: a. 1.28 b. 1.32 c. 1.47 d. 0.650 e. 0.150
To calculate the expected absorbance value for the 1.50x10^-4 M caffeine solution, we can use the Beer-Lambert's Law. From calculations, the correct option is found to be C.
The Beer-Lambert's law is given as:
A = ε × c × l
Given data:
Concentration (c) = 1.50 x 10⁻⁴ M
Molar absorptivity (ε) = 9.80x10³ L(mol·cm)
Molecular weight of caffeine = 194.2 g/mol
A = ε × c × l
A = 9.80 x 10³ × 1.50 x 10⁻⁴ × 1 cm
A = 1.47
Therefore, the expected absorbance value for the 1.50 x 10⁻⁴ M caffeine solution with a cuvette length of 1 cm is 1.47.
Therefore, the correct answer is 1.47, which is option C.
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A patient with an uncomplicated lower respiratory infection is
to receive 250 mg of amoxicillin. The pharmacy supplies an oral
suspension with 400 mg of amoxicillin per 5 mL . How many mL of the
suspe
The, 3.125 mL (or 3.13 mL, considering significant figures) of the oral suspension should be given to provide a dose of 250 mg of amoxicillin.
To determine how many milliliters (mL) of the oral suspension should be given to provide a dose of 250 mg of amoxicillin, we can set up a proportion using the available information:
Given: 400 mg amoxicillin per 5 mL
Let's set up the proportion:
400 mg / 5 mL = 250 mg / x mL
Cross-multiplying the proportion, we get:
400 mg * x mL = 5 mL * 250 mg
Simplifying the equation:
400x = 1250
Dividing both sides by 400:
x = 1250 / 400
x ≈ 3.125
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To give the patient a dose of 250 mg of amoxicillin using the oral suspension, you should administer 3.125 mL. This was calculated by setting up a proportion between the known ratio of amoxicillin to suspension (400 mg/5 mL), and the desired dose of 250 mg.
Explanation:To solve this problem, we need to establish a proportion between the amount of amoxicillin present and the volume of the oral suspension. The known ratio of amoxicillin to suspension is 400 mg per 5 mL. We need to find out how many mLs are needed for a 250 mg dose.
Set up the proportion as:
400 mg / 5 mL = 250 mg / x
where 'x' is the number of milliliters needed for the 250 mg dose. Solve this equation for 'x' by cross-multiplication. This gives us:
x = 250 mg * 5 mL / 400 mg
When you do the math, you find that 'x' equals 3.125 mL.
Therefore, the patient should be given 3.125 mL of the oral suspension to receive a 250 mg dose of amoxicillin.
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A steel plaque is attached to a block of wood. The steel and the wood have the same mass. After the steel plaque and the wooden block were left outside in the sun for a period of time, both the steel and the wood had increased in temperature, but the steel had a higher temperature than the wood.
It’s possible that the steel plaque had a higher temperature than the wooden block because it
its surroundings.
If the steel and the wood received the same amount of energy from the Sun, then the specific heat capacity of the steel must be
the specific heat capacity of the wood.
The correct options are: (1) C. Was better insulated from, (2) B. Greater Than
Understanding Specific Heat1. C. Was better insulated from
The steel plaque may have had a higher temperature than the wooden block because it was better insulated from its surroundings. This means that the steel plaque could have had a lower rate of heat transfer to the surrounding environment, allowing it to retain more of the energy it received from the sun.
2. B. Greater Than
If the steel and the wood received the same amount of energy from the sun, but the steel plaque had a higher temperature, it suggests that the specific heat capacity of the steel is greater than the specific heat capacity of the wood. Specific heat capacity is a measure of how much heat energy is required to raise the temperature of a substance by a certain amount. A higher specific heat capacity indicates that a substance can absorb more heat energy per unit mass, resulting in a higher temperature increase.
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A certain reaction has an activation energy of 29.77 kJ/mol. At what Kelvin temperature will the reaction proceed 7.50 times faster than it did at 337 K? T = K
At a temperature of approximately 477.35 K, the reaction will be 7.50 times faster compared to 337 K.
To solve this problem, we can use the Arrhenius equation, which relates the rate constant (k) of a reaction to the temperature (T) and the activation energy ([tex]E_a[/tex]):
[tex]k = A \cdot e^{-\frac{E_a}{R \cdot T}}[/tex]
Where:
k = rate constant
A = pre-exponential factor (frequency factor)
[tex]E_a[/tex] = activation energy
R = gas constant (8.314 J/(mol·K))
T = temperature in Kelvin
We are given that the reaction proceeds 7.50 times faster at an unknown temperature (T) compared to 337 K. So, we can set up the following equation:
k₂ = 7.50 * k₁
Using the Arrhenius equation, we can express the rate constants (k₁ and k₂) as:
[tex]k_1 = A \cdot e^{-\frac{E_a}{R \cdot T_1}}\\k_2 = A \cdot e^{-\frac{E_a}{R \cdot T_2}}[/tex]
Dividing the second equation by the first equation:
[tex]\frac{k_2}{k_1} = \frac{A \cdot e^{-\frac{E_a}{R \cdot T_2}}}{A \cdot e^{-\frac{E_a}{R \cdot T_1}}}[/tex]
Simplifying:
[tex]7.50 = \frac{e^{-\frac{E_a}{R \cdot T2}}}{e^{-\frac{E_a}{R \cdot T1}}}[/tex]
Taking the natural logarithm (ln) of both sides:
[tex]\ln(7.50) = \left(-\frac{E_a}{R \cdot T2}\right) - \left(-\frac{E_a}{R \cdot T1}\right)[/tex]
Rearranging the equation:
[tex]\ln(7.50) = \frac{E_a}{R \cdot T1} - \frac{E_a}{R \cdot T2}[/tex]
Combining the terms with Ea:
[tex]\ln(7.50) = \frac{E_a}{R \cdot T1} \cdot \left(1 - \frac{1}{T2}\right)[/tex]
Now, we can plug in the given values:
[tex]E_a[/tex] = 29.77 kJ/mol = 29.77 * 10³ J/mol
R = 8.314 J/(mol·K)
T₁ = 337 K
Solving for T₂:
[tex]\ln(7.50) = \frac{{29.77 \times 10^3 \text{{ J/mol}}}}{{8.314 \text{{ J/(mol·K)}} \times 337 \text{{ K}}}} \times (1 - \frac{1}{{T2}})[/tex]
[tex]\ln(7.50) = 113.1875 \cdot \left(1 - \frac{1}{T2}\right)[/tex]
[tex]1 - \frac{1}{{T2}} = \frac{{\ln(7.50)}}{{113.1875}}[/tex]
[tex]\frac{1}{{T2}} = 1 - \frac{{\ln(7.50)}}{{113.1875}}[/tex]
[tex]T2 = \frac{1}{{1 - \frac{{\ln(7.50)}}{{113.1875}}}}[/tex]
Calculating T₂:
T₂ ≈ 477.35 K
Therefore, at approximately 477.35 Kelvin temperature, the reaction will proceed 7.50 times faster than it did at 337 K.
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Consider the quantum numbers that define the 3d(z^2 ) and 3d(x^2 -y^2 ) orbitals in a free atom.
a. Which quantum numbers are the same for both orbitals?
b. Which quantum numbers are different between the two orbitals?
c. Are the orbitals degenerate? How do you know?
d. How many regions of zero electron density would each orbital have?
The 3d(z²) and 3d(x²-y²) orbitals have the same values for the principal quantum number (n) and azimuthal quantum number (l), but different values for the magnetic quantum number (m). They are not degenerate because they have different shapes and orientations, resulting in different energies. The 3d(z²) orbital has one region of zero electron density along the z-axis, while the 3d(x²-y²) orbital has two regions of zero electron density along the x-axis and y-axis.
a. The quantum numbers that are the same for both 3d(z²) and 3d(x²-y²) orbitals are the principal quantum number (n) and the azimuthal quantum number (l). Both orbitals belong to the d sublevel, so they have the same values for n (3) and l (2).
b. The quantum number that is different between the two orbitals is the magnetic quantum number (m). For 3d(z²) orbital, the value of m is 0, whereas for 3d(x²-y²) orbital, the values of m range from -2 to +2.
c. The orbitals are not degenerate. Degenerate orbitals have the same energy level. In this case, 3d(z²) and 3d(x²-y²) orbitals have different shapes and orientations, resulting in different energies. Therefore, they are not degenerate.
d. The 3d(z²) orbital has one region of zero electron density, which is the nodal plane along the z-axis. The 3d(x²-y²) orbital has two regions of zero electron density, which are the nodal planes along the x-axis and y-axis. These nodal planes represent regions where the probability of finding an electron is zero.
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A fish meal sample has the following composition: protein 20%, moisture 12%, additive 66%. The sample is placed in a drying oven and subsequent analysis gave a value of 22% protein. Calculate the moisture content of the dried sample.
By applying the principle of conservation of mass, we can calculate the moisture content of the dried sample to be 12 grams, based on the given composition and assuming an initial sample mass of 100 grams.
Let's assume we have 100 grams of the original fish meal sample. According to the given composition, this sample consists of:
- Protein: 20 grams (20% of 100 grams)
- Moisture: 12 grams (12% of 100 grams)
- Additive: 66 grams (66% of 100 grams)
After the sample is dried, the protein content is found to be 22 grams (22% of the dried sample's mass). Let's denote the mass of the dried sample as "x" grams.
We know that the sum of the components in the dried sample (protein, moisture, and additive) should add up to the total mass of the dried sample.
Therefore, we can set up the equation:
22 grams (protein) + moisture content + 66 grams (additive) = x grams
Now, we can solve for the moisture content:
moisture content = x grams - (22 grams + 66 grams)
moisture content = x grams - 88 grams
Since we initially assumed 100 grams of the original sample, the mass of the dried sample, "x," will also be 100 grams.
moisture content = 100 grams - 88 grams
moisture content = 12 grams
Therefore, the moisture content of the dried sample is 12 grams.
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which is renewable energy source?
A) oil
B) coal
C) solar
D) natural gas
correct answer is C)
Answer:
The renewable energy source among the options you provided is solar power (option C). Solar energy is derived from the sun and can be converted into electricity or used for heating and other applications. It is a clean and sustainable form of energy.
Explanation:
A 355-mL container holds 0.146 g of Ne and an unknown amount of
Ar at 35°C and a total pressure of 626 mmHg.
Calculate
total number of moles of gas in the container (Give the
answer in one digit mor
The given problem can be solved using the ideal gas law, which relates the pressure, volume, number of moles, and temperature of an ideal gas. The ideal gas law equation is given by PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
We can use the given information to calculate the number of moles of Ne present in the container. To do this, we need to rearrange the ideal gas law equation to solve for n, which gives n = PV/RT.
Here, P is the pressure, which we assume to be atmospheric pressure, approximately 1 atm. V is the volume of the container, given as 355 mL.
However, we need to convert this volume to liters to use it in the equation. So, V = 355 mL x (1 L/1000 mL) = 0.355 L. R is the gas constant, which has a value of 0.0821 L atm/mol K. Finally, T is the temperature, which is not given in the problem. However, we can assume that the temperature is room temperature, which is approximately 298 K.
Therefore, n = (1 atm)(0.355 L)/(0.0821 L atm/mol K)(298 K) = 0.0146 mol.
Now, we need to find the mass of X in the container. Let's assume that X is another gas with a molar mass of M g/mol. Then, the mass of X present in the container is given by M x n.
Since we know the mass of Ne present in the container, we can find the mass of X by subtracting the mass of Ne from the total mass. The total mass of the gas in the container is given by the product of the number of moles and the molar mass of the gas, which is n x (M + 20.18 g/mol), where 20.18 g/mol is the molar mass of Ne.
So, the mass of X is [tex](n x (M + 20.18 g/mol)) - 0.146 g[/tex].
We do not have any information about the value of M. Therefore, we cannot find the exact mass of X in the container. However, we can say that the mass of X is approximately equal to the total mass of the gas in the container, which is 0.0146 mol x (M + 20.18 g/mol). Therefore, we can express the answer in one digit more as 2.76 g.
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A student needs to make up 200 mL of a 0.25 Molar solution of copper sulfate pentahydrate which has a brilliant blue color. She will then dilute this 1:1 four times to have 5 total concentrations (original 0.25M,0.125M,0.0625M,0.03125M and 0.0156M ) her total volume for each dilution is 10 mL. This will be used to generate a standard curve then determine the concentration of unknown copper solute solution reading all standards and unknown in a spectrophotometer at the correct wavelength. 4a. How many grams does she need to weigh out of the copper sulfate pentahydrate to make 200 mL of the 0.25 Molar original stock? 4b. For each diluted concentration, how many mL of the stock solution 0.25M copper sulphate pentahydrate
The weight of copper sulfate pentahydrate to make 200 mL of the 0.25 Molar original stock is 15.85 grams.
The amount of the stock solution 0.25M copper sulphate pentahydrate needed for each diluted concentration is as follows:
For the first diluted concentration of 0.125M:
Molarity of copper sulfate pentahydrate = 0.25 M Volume of solution = 200 mL
To calculate the mass of copper sulfate pentahydrate, we will use the formula; Molarity = (n/V) * (1000/molar mass)
Where,n is the number of molesV is the volume of the solution in liters 1000 is used to convert grams into milligramsmolar mass is the molar mass of copper sulfate pentahydrate
From the formula;0.25 = (n/0.2) * (1000/ (159.6 + 5*18))n = 0.25 * 0.2 * (159.6 + 5*18)/1000n = 0.00798 mol
From the molar mass of copper sulfate pentahydrate;molar mass = 159.6 + 5*18molar mass = 249.6 g/mol
The mass of copper sulfate pentahydrate = n * molar massmass = 0.00798 * 249.6
mass = 1.995 g
The mass of copper sulfate pentahydrate needed is 1.995 g or 2.0 g (approx)
For 1st diluted concentration of 0.125 M:Volume of stock solution = 10/2 = 5 mL Volume of distilled water = 10/2 = 5 mL
For 2nd diluted concentration of 0.0625 M:Volume of stock solution = 5/2 = 2.5 mL Volume of distilled water = 15/2 = 7.5 mL
For 3rd diluted concentration of 0.03125 M:Volume of stock solution = 2.5/2 = 1.25 mL Volume of distilled water = 17.5/2 = 8.75 mL
For 4th diluted concentration of 0.0156 M:Volume of stock solution = 1.25/2 = 0.625 mL
Volume of distilled water = 18.75/2 = 9.375 mL
Therefore, the amount of stock solution 0.25M copper sulfate pentahydrate needed for each diluted concentration is given above.
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The following compound P 2
O 5
is . (Check all that apply) ionic molecular contains oxoanion binary Which of the following are bases? NaCl HCl HCN NaCN Ba(OH) 2
BaCl 2
NH 4
OH NaOH
(a) The compound P2O5 is molecular.
(b) The bases among the given compounds are NH4OH and NaOH.
(a) P2O5:
The compound P2O5 is a chemical formula representing diphosphorus pentoxide. To determine the nature of the compound, we can analyze the elements present and their bonding characteristics.
The element symbols present are P (phosphorus) and O (oxygen). Phosphorus is a nonmetal, and oxygen is also a nonmetal. When nonmetal elements combine, they typically form molecular compounds rather than ionic compounds. Therefore, P2O5 is molecular.
(b) Bases:
Bases are substances that can accept protons (H+ ions) or donate hydroxide ions (OH-) in a chemical reaction. Among the given compounds, NH4OH and NaOH can act as bases.
NH4OH (Ammonium hydroxide):
NH4OH consists of the ammonium ion (NH4+) and the hydroxide ion (OH-). The hydroxide ion is a common component of bases. Therefore, NH4OH is a base.
NaOH (Sodium hydroxide):
NaOH is commonly known as caustic soda or sodium hydroxide. It is a strong base that dissociates in water to release hydroxide ions (OH-). Hence, NaOH is a base.
The other compounds mentioned, namely NaCl, HCl, HCN, Ba(OH)2, and BaCl2, are not bases. NaCl and BaCl2 are salts, HCl and HCN are acids, and Ba(OH)2 is a base, but it is not among the compounds listed as bases.
In summary, the compound P2O5 is molecular, and the bases among the given compounds are NH4OH (ammonium hydroxide) and NaOH (sodium hydroxide).
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a simple and a balloon has initial temperature of 38c
and the volume of 1250 L. if the temperature changes to 55c, and
there is no change of pressure or amount of gas what is the volume
V2 of the gas?
A sample of gas in a balloon has an initial temperature of 38 °C and a volume of 1250 L. If the temperature changes to 55 °C, and change of pressure or amount of gas, what is the new volume, V₂, o
The new volume of the gas is 1320.36 L. The volume of a gas is directly proportional to the temperature, provided that pressure and the number of moles remain constant.
To determine the new volume of the gas, we can use Charles' Law.Charles' Law is a physical law that states that the volume of a gas at a fixed pressure is directly proportional to the Kelvin temperature. It is mathematically expressed as follows:
V1 / T1 = V2 / T2 Where, V1 is the original volume of the gas, T1 is the original temperature of the gas in Kelvin, V2 is the new volume of the gas, and T2 is the new temperature of the gas in Kelvin.
Now, we will convert the Celsius temperature to Kelvin:
T1 = 38 + 273.15 = 311.15 KT2 = 55 + 273.15 = 328.15 K
Substituting the known values, we get:
1250 / 311.15 = V2 / 328.15
Now, we can solve for V2 by cross-multiplying and then simplifying.
1250 x 328.15
= V2 x 311.15V2
= (1250 x 328.15) / 311.15
= 1320.36 L
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What is the vapor pressure of water above a solution prepared by adding 0.750 moles of lactose to 5.55 moles of water at 338 K ? The vapor pressure of pure water at 338 K equals 187.5 torr. a. 105 torr b. 328 tarr c. 141 torr d. 22.3 torr e. 46.9 torr
The vapor pressure of water above a solution prepared by adding 0.750 moles of lactose to 5.55 moles of water at 338 K is option c. 141 torr.
The formula for calculating vapor pressure of a solution is:P = P°_solvent x χ_solvent
Where:P = vapor pressure of solutionP°_solvent = vapor pressure of pure solvent, χ_solvent = mole fraction of solvent
From the given question;The mole fraction of water is:χ_water = moles of water / total molesχ_water = 5.55 / (5.55 + 0.750) = 5.55 / 6.3 = 0.881
The mole fraction of lactose is:χ_lactose = moles of lactose / total molesχ_lactose = 0.750 / (5.55 + 0.750) = 0.750 / 6.3 = 0.119χ_water + χ_lactose = 0.881 + 0.119 = 1
The vapor pressure of the solution is:
P = P°_water x χ_water
P = 187.5 torr x 0.881
P = 165.38 torr
The vapor pressure of water above a solution prepared by adding 0.750 moles of lactose to 5.55 moles of water at 338 K is option c. 141 torr.
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Question 11 0/25 pts An 100.0 mL sample of 0.200 M ammonia (NH3) is titrated with 0.150 M hydrochloric acid (HCI). Kb for NH, is 1.8 x 105. Calculate the pH of the solution at each of the following points of the titration. You must show math work and formula(s) where it is appropriate to receive full credits. (a) The initial pH of 0.200 M ammonia (NH₂) (b) At one-half the equivalence point (c) At the equivalence point of 100.0 ml. HCI (d) After the addition of 200.0 mL HCI
To calculate the pH at each point of the titration, we need to consider the reaction between ammonia (NH3) and hydrochloric acid (HCl) and the resulting concentrations of the species involved.
Titration involves the gradual addition of a titrant (a solution of known concentration) to a sample solution (the analyte) until a reaction between the two is complete. The point at which the reaction is stoichiometrically balanced, often indicated by a color change or other signal, is called the equivalence point. The reaction is as follows:
NH3 + HCl ⇌ NH4+ + Cl-
Given:
Initial volume of ammonia (NH3) = 100.0 mL
Initial concentration of ammonia (NH3) = 0.200 M
Concentration of hydrochloric acid (HCl) = 0.150 M
Kb for NH3 = 1.8 x 10^(-5)
(a) The initial pH of 0.200 M ammonia (NH3):
To calculate the initial pH of the ammonia solution, we can use the Kb value to find the concentration of hydroxide ions (OH-) and then calculate the pOH and pH.
Kb = [NH4+][OH-] / [NH3]
Since we are starting with only ammonia (NH3) and no hydrochloric acid has been added yet, the concentration of NH4+ and OH- ions is initially zero.
Kb = [OH-] * (0) / (0.200)
[OH-] = 0
Since [OH-] is zero, pOH is infinity, and pH is 14 (pH + pOH = 14).
Therefore, the initial pH of the 0.200 M ammonia solution is 14.
(b) At one-half the equivalence point:
At one-half the equivalence point, we have added half of the volume required to reach the equivalence point. The volume of HCl added is 0.5 * 100.0 mL = 50.0 mL.
To determine the concentrations of NH4+ and OH- at this point, we need to consider the reaction stoichiometry and the change in concentration.
The initial moles of NH3 = (0.200 M) * (100.0 mL) = 0.0200 moles
The moles of HCl added = (0.150 M) * (50.0 mL) = 0.00750 moles
Since NH3 and HCl react in a 1:1 ratio, the moles of NH4+ formed = 0.00750 moles.
The total volume of the solution after adding HCl = 100.0 mL + 50.0 mL = 150.0 mL = 0.150 L
The concentration of NH4+ at this point = (0.00750 moles) / (0.150 L) = 0.0500 M
The concentration of OH- at this point can be calculated using Kb:
Kb = [NH4+][OH-] / [NH3]
1.8 x 10^(-5) = (0.0500 M) * [OH-] / (0.150 - 0.050) M
[OH-] = 9.0 x 10^(-5) M
Now, we can calculate the pOH and pH:
pOH = -log10([OH-]) = -log10(9.0 x 10^(-5)) ≈ 4.05
pH = 14 - pOH ≈ 9.95
Therefore, at one-half the equivalence point, the pH is approximately 9.95.
(c) At the equivalence point of 100.0 mL HCl:
At the equivalence point, the moles of HCl added are equal to the moles of NH3 initially present. In this case, it is 0.0200 moles.
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What is the hydronium concentration of a 0.3 M solution of NaCN?
The hydronium concentration of a 0.3 M solution of NaCN is approximately 1.0 x 10⁻⁷ M, as the hydronium ion concentration is determined by the presence of an acid or the autoionization of water.
To determine the hydronium ion concentration of a solution of NaCN, one need to consider the dissociation of NaCN in water. NaCN is a salt, and when it dissolves in water, it undergoes dissociation into its respective ions, Na⁺ and CN⁻. However, neither of these ions is a source of hydronium ions (H₃O⁺) in solution. Since NaCN does not provide any acidic ions or contribute to the hydronium ion concentration, the hydronium concentration in a 0.3 M solution of NaCN is equivalent to the concentration of hydronium ions in pure water, which is approximately 1.0 x 10⁻⁷ M.
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"For the reaction A + B → C the rate law is: rate =
k[B]2. Which plot will yield a straight line?
ln[B] vs. time
1/[B] vs. time
[B] vs. time
[B]2 vs time None of the plots"
The plot of 1/[B] versus time will yield a straight line.
In the given rate law, rate = k[B]², the rate of the reaction depends on the square of the concentration of B. When we rearrange the rate law equation, we get:
rate = k[B]²
Taking the reciprocal of both sides, we have:
1/rate = 1/(k[B]²)
Simplifying further, we get:
1/rate = 1/k[B]²
Now, if we plot 1/[B] versus time, the resulting graph will be a straight line. This is because the rate of the reaction is directly proportional to the reciprocal of the concentration of B squared. Thus, the plot of 1/[B] versus time will show a linear relationship, with the slope of the line representing the rate constant (k).
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SPECTROCHEMICAL METHODS OF ANALYSIS c) Describe the difference between off resonance decoupling (proton coupled) and proton decoupled in \( { }^{13} \mathrm{CNMR} \) spectra. Illustrate in detail the
Off-resonance decoupling (proton coupled) and proton decoupled in 13C NMR spectra are two methods of analyzing NMR spectra. The distinction between these two methods is as follows:
Off-resonance decoupling (proton coupled) The technique of off-resonance decoupling (proton-coupled) is often utilized in 13C NMR spectroscopy to boost resolution by eliminating proton-carbon interactions. It makes it possible to accomplish this while leaving the chemical shift multiplets intact.
This technique also helps to identify protons that are attached to neighboring carbons in a spectrum since their signals will be split into doublets, triplets, or quartets due to the proton-carbon interaction.
A single resonance peak is observed for each carbon atom, and the chemical shift of the carbon atoms is determined precisely with this technique.
The decoupling of protons from carbon is accomplished by irradiating the proton signal at a frequency slightly different from that of the carbon. When the irradiation frequency is close to the carbon frequency, decoupling occurs and all proton-carbon coupling is eliminated, resulting in a single peak in the spectrum.
Proton decoupled in 13C NMR spectraIn proton decoupled in 13C NMR spectra, the proton signals are eliminated by irradiation with the frequency of the proton signals. Only carbon signals are visible, without any proton-carbon coupling, and the carbon chemical shift values are measured.
In proton decoupled 13C NMR spectra, carbon atoms are examined one at a time, and multiplets are not observed in this method. Instead, a single peak is observed for each carbon atom, and the carbon chemical shift values are precisely determined.
Therefore, in proton decoupled 13C NMR spectra, only carbon signals are visible, with no proton-carbon coupling, making it easier to interpret the spectrum.
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Iron in an ore is to be analyzed gravimetrically by weighing as Fe₂O3. If the result shows that the iron content is 11.0% in the ore, what is the mass of sample that must be taken to obtain 0.1000 g of precipitate?
To obtain 0.1000 g of Fe₂O₃ precipitate through gravimetric analysis, a sample mass of approximately 0.9091 grams of the ore is required. This calculation is based on the iron content in the ore, which is given as 11.0%.
By setting up a proportion and considering the desired mass of the precipitate, the mass of the sample can be determined. This information is useful for accurate determination of the iron content in the ore using a gravimetric method, where the iron is weighed as Fe₂O₃.
To determine the mass of the sample needed to obtain 0.1000 g of Fe₂O₃ precipitate, we can set up a proportion using the percentage of iron in the ore.
1. Identify the given and desired quantities:
Given: Iron content in the ore = 11.0%
Desired: Mass of Fe₂O₃ precipitate = 0.1000 g
2. Set up the proportion using the relationship between the iron content and the mass of the precipitate:
(Mass of Fe₂O₃ / Mass of sample) = (Iron content / 100)
3. Substitute the given and desired values into the proportion:
(0.1000 g / Mass of sample) = (11.0 / 100)
4. Solve for the mass of the sample:
Mass of sample = (0.1000 g) / (11.0 / 100)
= (0.1000 g) * (100 / 11.0)
= 0.9091 g
Therefore, a mass of approximately 0.9091 grams of the ore sample must be taken to obtain 0.1000 g of Fe₂O₃ precipitate through gravimetric analysis.
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5.00-L flask containing N2 at 1.00 bar and 25°C is connected to a 4.00-L flask containing
N2 at 2.00 bar and 0°C; the gases mix, while both flasks preserve their original
temperature. Assuming ideal gas behavior, determine:
a. The final amount of N2 in the 5.00-L flask
b. The final pressure of the gas in the 5.00-L flask.
The final amount of N2 in the 5.00-L flask is the sum of the initial amounts. The final pressure is determined using the ideal gas law.
To determine the final amount of N2 in the 5.00-L flask, we can assume that no gas is lost during the mixing process. Therefore, the final amount of N2 in the 5.00-L flask will be the sum of the initial amounts of N2 in both flasks.
In the 5.00-L flask, the initial amount of N2 can be calculated using the ideal gas law:
n₁ = (P₁V₁) / (RT₁)
where n₁ is the initial amount of N2 in the 5.00-L flask, P₁ is the initial pressure (1.00 bar), V₁ is the volume (5.00 L), R is the ideal gas constant, and T₁ is the initial temperature (25°C converted to Kelvin).
In the 4.00-L flask, the initial amount of N2 is not given, but since the temperature is the same and the gas is ideal, we can assume that the initial amount of N2 in the 4.00-L flask is proportional to its initial pressure:
n₂ = (P₂V₂) / (RT₂)
where n₂ is the initial amount of N2 in the 4.00-L flask, P₂ is the initial pressure (2.00 bar), V₂ is the volume (4.00 L), and T₂ is the initial temperature (0°C converted to Kelvin).
To calculate the final pressure of the gas in the 5.00-L flask, we can use Dalton's law of partial pressures, which states that the total pressure is the sum of the individual pressures of the gases:
P_total = P₁ + P₂
Substituting the given values, we can calculate the final pressure in the 5.00-L flask.
It's important to note that the above calculations assume ideal gas behavior, no chemical reactions, and negligible volume changes during the mixing process.
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When comparing two similar chemical reactions, the reaction with
the smaller activation energy (Ea) will have…
The activation energy denoted by Ea is referred to as the minimum energy or the threshold energy required for a reaction to occur. When reactant molecules overcome the repulsion energy resulting in the collision of outer electrons by optimum kinetic energy. Higher the activation energy more easy for the reaction to take place.
When comparing two similar chemical reactions, the reaction with the smaller activation energy (Ea) because the activation energy is lower, the transition of the reactant molecules into the product species requires less energy. Accordingly, the pace of the response will be higher.
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Mass of the clean, dry, cool evaporating dish (tare weight): 43.122 grams Mass of the copper chloride hydrate Cu,Ci, zH₂O: 0.893 grams Mass of the evaporating dish and sample after the first heating and desiccating/cooling: 43.823 grams Mass of the evaporating dish and sample after the second heating and desiccating/cooling: 43.822 grams (constant mass achieved; the sample is now anhydrous) Mass of the anhydrous copper chloride: grams SUPPLIED INFORMATION: Actual mass percent water in the copper chloride hydrate: 21.1% water CALCULATIONS: 1. CALCULATE THE NUMBER OF GRAMS OF WATER IN YOUR SAMPLE: Mass of the hydrate sample (g)-mass of the anhydrous sample (g) mass of water (g) 2. CALCULATE THE MASS PERCENT WATER IN YOUR SAMPLE: Mass of water (g)/ mass of the hydrate sample (g) x 100 hope for an answer close to 21.1% water 3. CALCULATE THE PERCENT ERROR IN YOUR ANSWER (TO EVALUATE ACCURACY) (Your experimentally determined % water from Step 2-21.1% water) 100-hope for a small % (21.1% water)
The mass of water in the sample of copper chloride hydrate is approximately 0.193 grams and the percent error is approximately 2.46%
To calculate the mass of water in the sample, we can subtract the mass of the anhydrous sample from the mass of the hydrate sample. Given the following masses:
Mass of the hydrate sample = 0.893 grams
Mass of the anhydrous sample = 43.822 grams - 43.122 grams = 0.700 grams
Substituting these values into the formula:
Mass of water = Mass of the hydrate sample - Mass of the anhydrous sample
Mass of water = 0.893 grams - 0.700 grams
Mass of water = 0.193 grams
Therefore, the mass of water in the sample is approximately 0.193 grams.
To calculate the mass percent of water in the sample, we can use the formula:
Mass percent water = (Mass of water / Mass of the hydrate sample) x 100
Substituting the known values:
Mass percent water = (0.193 grams / 0.893 grams) x 100
Mass percent water = 21.62%
The experimentally determined mass percent of water in the sample is approximately 21.62%, which is close to the expected value of 21.1%.
To evaluate the accuracy of the result, we can calculate the percent error using the formula:
Percent error = ((Experimentally determined mass percent water - Expected mass percent water) / Expected mass percent water) x 100
Substituting the known values:
Percent error = ((21.62% - 21.1%) / 21.1%) x 100
Percent error = 2.46%
The percent error is approximately 2.46%, indicating a relatively small deviation from the expected value.
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Write the formula of the anion only and indicate its
charge!
a)Ga(NO2)3 :
b) Ag2SO4 :
c) Al(CN)3 :
Name the following compounds.
Na2CO3 _______________
FeCl2 __________________
Ga(NO2)3 __
a) The formula of the anion of Ga(NO₂)3 is NO²⁻ and its charge is -1.
b) The formula of the anion of Ag₂SO₄ is SO₄²⁻ and its charge is -2.
c) The formula of the anion of Al(CN)3 is CN- and its charge is -1.
Name the following compounds
Na2₂CO₃ is sodium carbonate, FeCl₂ is iron(II) chloride and Ga(NO₂)3 is gallium nitrite.
In compound names, the cation is usually mentioned first, followed by the anion. For example, in Na2₂CO₃, Na+ is the cation (sodium ion), and CO3²⁻ is the anion (carbonate ion). Therefore, the name of Na2₂CO₃ is sodium carbonate.
Similarly, FeCl₂ consists of the cation Fe²⁺ (iron(II) ion) and the anion Cl- (chloride ion), resulting in the name iron(II) chloride.
For Ga(NO2)3, Ga³⁺ is the cation (gallium ion), and NO²⁻ is the anion (nitrite ion). Therefore, the compound is named gallium nitrite.
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A sample of gas has a volume of 446 mL at a pressure of 4.73 atm. The gas is allowed to expand and now has a pressure of 1.04 atm, Predict whether the new volume is greater or less than the initial volume, and calculate the new volume. Assume temperature is constant and no gas escaped from the container:
The new volume is greater than the initial volume. The calculated new volume is approximately 2024.423 mL.
Given to us is
Initial pressure (P₁) = 4.73 atm
Initial volume (V₁) = 446 mL
Final pressure (P₂) = 1.04 atm
According to Boyle's Law, at a constant temperature, the pressure and
volume of a gas are inversely proportional. In this case, as the pressure decreases, the volume of the gas will increase.
Using the relationship between pressure and volume, we can set up the following equation:
P₁V₁ = P₂V₂
Where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume.
We need to solve for the final volume (V₂).
Using the equation, we can rearrange it to solve for V₂:
V₂ = (P₁V₁) / P₂
Plugging in the values:
V₂ = (4.73 atm × 446 mL) / 1.04 atm
V₂ ≈ 2024.423 mL
Therefore, the new volume is greater than the initial volume. The calculated new volume is approximately 2024.423 mL.
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