The new pressure of the gas is determined as 5.89 atm.
What is the new pressure of the gas?The new pressure of the gas is calculated by applying the formula for general gas equation.
P₁V₁/T₁ = P₂V₂/T₂
P₂ = P₁V₁T₂/V₂T₁
Where;
P₁ is the initial pressure of the gasV₁ is the initial volume of the gasT₁ is the initial temperature of the gasV₂ is the final volume of the gasT₂ is the final temperature of the gasThe new pressure of the gas is calculated as;
P₂ = P₁V₁T₂/T₁V₂
P₂ = ( 10 x 25 x 245 ) / ( 208 x 50 )
P₂ = 5.89 atm
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Select all statements concerning metallocenes that are true (you may select more than one answer) Select one or more: a. Ferrocene is paramagnetic b. Metallocene complexes always have 18 valence electrons c. Nickelocene is paramagnetic d. Nickelocene has 20 valence electrons e. Metallocenes are never stable in air f. Metallocenes typically contain cyclopentadienyl (C5H5− )ions bound to a transition metal centre g. Titanocene is highly unstable due to a low valence electron count. h. Cobaltocene is more stable than ferrocene as a result of a higher valence electron count.
The correct statements concerning metallocenes are: b. Metallocene complexes always have 18 valence electrons f. Metallocenes typically contain cyclopentadienyl (C5H5−) ions bound to a transition metal center
Metallocene complexes, including ferrocene and nickelocene, have 18 valence electrons. This is known as the 18-electron rule, which states that stable transition metal complexes often have 18 valence electrons.
Metallocenes typically contain cyclopentadienyl (C5H5−) ions bound to a transition metal center. This is a defining characteristic of metallocenes, where the cyclopentadienyl ligands coordinate to the transition metal.
The other statements are incorrect:
a. Ferrocene is not paramagnetic. It is diamagnetic due to the pairing of electrons in the iron atom.
c. Nickelocene is paramagnetic. It has two unpaired electrons, making it paramagnetic.
d. Nickelocene has 18 valence electrons, not 20.
e. The stability of metallocenes in air can vary depending on the specific compound and conditions. Some metallocenes can be stable in air.
g. Titanocene is generally stable, and its stability is not solely attributed to its valence electron count.
h. Cobaltocene is less stable than ferrocene due to its lower valence electron count. Ferrocene has 18 valence electrons, while cobaltocene has 17 valence electrons.
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Provide a Mnemonic Devices to help you remember the physical properties of a substance/ chemical. It the device must make since and include all of the letters discussed in class. I will
Mnemonic devices are memory aids that can help you remember information. Here's a mnemonic device to help you remember the physical properties of a substance/chemical:
1. Solid: S - Something you can hold or Stand on
2. Liquid: L - Like water that can flow
3. Gas: G - Like air that is Gaseous
This mnemonic device uses the first letters of each physical property (solid, liquid, gas) to create a memorable phrase. It associates each property with a simple word or concept that is easy to visualize.
1. Solid: Think of something you can hold or stand on, like a rock or the ground. This helps you remember that solids have a definite shape and volume.
2. Liquid: Imagine water flowing, like in a river or a glass being poured. This helps you remember that liquids can flow and take the shape of their container.
3. Gas: Visualize air, which is gaseous and fills the space it's in. This helps you remember that gases have no definite shape or volume.
To remember the physical properties of a substance/chemical, you can use the mnemonic device "S-L-G." Think of a solid as something you can hold or stand on, a liquid as something that can flow like water, and a gas as something gaseous like air. This mnemonic device helps you associate each property with a memorable word or concept, making it easier to remember.
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7. Consider an electren in a iparegen atom thas is transitioning from the n=5 to the of =1 leveli, (a) Fill in the blanki in order for this transition to occur wit the photon be Tries Dis units in your answer. Tries 0y5 your answer. Tries 6 5
=
The transition of an electron in a hydrogen atom from the n=5 to the nf=1 level requires the absorption or emission of a photon with a wavelength of approximately 97.2 nm. This corresponds to the ultraviolet region of the electromagnetic spectrum.
In order to determine the wavelength of the photon involved in the transition, we can use the equation:
[tex]\[ \Delta E = \frac{{hc}}{{\lambda}} \][/tex]
where ΔE is the energy difference between the initial and final energy levels, h is Planck's constant (approximately 6.626 x 10^-34 J*s), c is the speed of light (approximately 3.00 x 10^8 m/s), and λ is the wavelength of the photon.
The energy difference between the n=5 and nf=1 levels can be calculated using the formula:
[tex]\[ \Delta E = E_f - E_i = -\frac{{13.6 \, \text{eV}}}{{n_f^2}} + \frac{{13.6 \, \text{eV}}}{{n_i^2}} \][/tex]
Substituting n_f = 1 and n_i = 5 into the equation, we get:
[tex]\[ \Delta E = -\frac{{13.6 \, \text{eV}}}{{1^2}} + \frac{{13.6 \, \text{eV}}}{{5^2}} \][/tex]
Simplifying the expression, we find:
[tex]\[ \Delta E = 13.6 \, \text{eV} - 0.544 \, \text{eV} \approx 13.056 \, \text{eV} \][/tex]
To convert the energy difference to joules, we can use the conversion factor 1 eV = 1.602 x 10^-19 J:
[tex]\[ \Delta E = 13.056 \, \text{eV} \times 1.602 \times 10^{-19} \, \text{J/eV} \approx 2.09 \times 10^{-18} \, \text{J} \][/tex]
Now we can rearrange the first equation to solve for λ:
[tex]\[ \lambda = \frac{{hc}}{{\Delta E}} = \frac{{(6.626 \times 10^{-34} \, \text{J*s})(3.00 \times 10^8 \, \text{m/s})}}{{2.09 \times 10^{-18} \, \text{J}}} \approx 97.2 \, \text{nm} \][/tex]
Therefore, the photon involved in this transition has a wavelength of approximately 97.2 nm, which falls within the ultraviolet region of the electromagnetic spectrum.
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Consider a mixture of soil and water and. Impart it to a colloid, such as milk. Which property best differentiates these two mixtures?
A. Soil and water is a suspension because it consists of minute particles suspended in the medium. Milk is a colloid because it consists of larger particles suspended in the medium, which start to settle when allowed to stand.
B. Soil and water is a colloid because it consists of minute particles suspended in the medium. Milk is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand
c. Soil and water is a colloid because it has a uniform composition. Milk is a suspension because it doesn't have a uniform
composition
D. Soil and water is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand. Milk is a colloid because it consists of minute particles that remain suspended in the medium.
E. Soil and water is a suspension because it has a uniform composition. Milk is a colloid because it doesn't have a uniform
composition.
Soil and water is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand. Milk is a colloid because it consists of minute particles that remain suspended in the medium.
The correct answer is (D)
The mixture of soil and water is considered to be a suspension because it is composed of minute particles suspended in the medium. Milk, on the other hand, is a colloid because it consists of larger particles suspended in the medium, which start to settle when allowed to stand.
There are a few differences between these two mixtures, but the most important one is their particle size.
A colloid is a mixture of two or more substances in which one substance is finely dispersed in the other.
The dispersed particles are usually between 1 and 1000 nanometers in size, making them too small to be seen with the eye.In contrast, a suspension is a mixture in which small particles of a solid are dispersed throughout a liquid. These particles are usually much larger than the particles in a colloid, ranging from 100 to 10,000 nanometers in size. As a result, they can be seen with the eye and will eventually settle out of the liquid if left undisturbed.
The property that best differentiates these two mixtures is their stability.
Colloids are much more stable than suspensions because the particles are smaller and more evenly dispersed throughout the medium.
They do not settle out of the medium as easily as suspensions and are not affected by gravity to the same extent. On the other hand, suspensions are less stable because the particles are larger and tend to settle out of the medium over time if left undisturbed.
In conclusion, the property that best differentiates the mixture of soil and water (a suspension) from milk (a colloid) is their particle size. Colloids have smaller particles that are more evenly dispersed throughout the medium, making them more stable than suspensions, which have larger particles that tend to settle out of the medium over time.
The correct answer is (D)
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When solid sodium is added to liquid water, it reacts with the
water to produce hydrogen gas and aqueous sodium hydroxide.
(Answer in the box not working)
When solid sodium is added to liquid water, it reacts with the water to produce hydrogen gas (H2) and aqueous sodium hydroxide (NaOH).
The reaction between solid sodium and liquid water is a highly exothermic and vigorous reaction. It is a single displacement reaction, where sodium replaces hydrogen in water to form sodium hydroxide and liberates hydrogen gas. The balanced chemical equation for the reaction is:
2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)
In this reaction, sodium (Na) loses an electron to form sodium ions (Na+), while water (H2O) is split into hydroxide ions (OH-) and hydrogen ions (H+).
The hydroxide ions combine with the sodium ions to form sodium hydroxide (NaOH), which dissolves in water to give an aqueous solution. Simultaneously, hydrogen gas (H2) is released as a product, which can be observed as effervescence or bubbles.
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The following initial rate data are for the gas phase reaction of hydrogen with iodine: H₂+I2 → 2 HI Experiment 1 2 3 4 Rate = [H₂]0, M 0.0832 0.0832 k = 0.166 0.166 M-¹ [12]0, M 0.0254 -1 S 0.0508 Complete the rate law for this reaction in the box below. Use the form k[A] [B]", where '1' is understood for m or n and concentrations taken to the zero power do not appear. Don't enter 1 for m or n. 0.0254 0.0508 Initial Rate, M.s¹ 3.87 x 10-21 7.73 x 10-21 7.72 x 10-21 1.54 x 10-20
The rate law for the reaction H₂ + I₂ → 2 HI is rate = (6.08 × 10⁹ M⁻² s⁻¹)[H₂][I₂], where k is the rate constant. Experimental data shows that the initial rate is directly proportional to the concentration of H₂ and independent of the concentration of I₂.
The rate law for the reaction H₂ + I₂ → 2 HI is:
rate = k[H₂][I₂]
where k is the rate constant.
To determine the rate law, we can use the method of initial rates. This method involves comparing the initial rates of reaction for different experiments, where only one reactant concentration is varied at a time.
In Experiment 1, the initial concentrations of H₂ and I₂ are both 0.0832 M and the initial rate is 3.87 × 10⁻²¹ M s⁻¹. In Experiment 2, the initial concentration of H₂ is doubled to 0.166 M, while the initial concentration of I₂ remains at 0.0832 M. The initial rate in Experiment 2 is also doubled, to 7.73 × 10⁻²¹ M s⁻¹. This shows that the initial rate is directly proportional to the concentration of H₂.
In Experiment 3, the initial concentration of I₂ is doubled to 0.166 M, while the initial concentration of H₂ remains at 0.0832 M. The initial rate in Experiment 3 is the same as the initial rate in Experiment 1. This shows that the initial rate is independent of the concentration of I₂.
Therefore, the rate law for the reaction H₂ + I₂ → 2 HI is:
rate = k[H₂][I₂]
where k is the rate constant.
The rate constant can be determined by substituting the initial rate and the initial concentrations of H₂ and I₂ into the rate law. For example, in Experiment 1, the initial rate is 3.87 × 10⁻²¹ M s⁻¹, the initial concentration of H₂ is 0.0832 M, and the initial concentration of I₂ is 0.0832 M.
Substituting these values into the rate law gives:
rate = k[H₂][I₂] = 3.87 × 10⁻²¹ M s⁻¹ = k(0.0832 M)(0.0832 M)
Solving for k gives k = 6.08 × 10⁹ M⁻² s⁻¹. Therefore, the rate law for the reaction H₂ + I₂ → 2 HI is:
rate = (6.08 × 10⁹ M⁻² s⁻¹)[H₂][I₂]
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Write the equilibrium expressions, Kc for the following reactions: a) CO 2
(g)+C(s, graphite )⇌2CO(g) b) Tl(s)+3Au +
(aq)⇌Tl 3+
(aq)+3Au(s) c) C 6
H 12
O 6
(aq)+6O 2
(g)⇌6CO 2
(g)+6H 2
O(g)
The stoichiometric coefficients in the balanced equation determine the powers to which the concentrations are raised in the equilibrium expression.
a) The equilibrium expression for the reaction:
CO₂(g) + C(s) ⇌ 2CO(g)
is:
Kc = [CO]² / [CO₂] [C]
b) The equilibrium expression for the reaction:
Tl(s) + 3Au+(aq) ⇌ Tl₃+(aq) + 3Au(s)
is:
Kc = [Tl₃+] [Au]³ / [Tl] [Au+]³
c) The equilibrium expression for the reaction:
C₆H₁₂O₆(aq) + 6O₂(g) ⇌ 6CO₂(g) + 6H₂O(g)
is:
Kc = [CO₂]⁶ [H₂O]⁶ / [C₆H₁₂O₆] [O₂]⁶
In each expression, the concentration of the species involved in the reaction is denoted by square brackets.
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What is the pH of a solution when the concentration of H +
is 0.60M ? a. −3.98 b. 0.51 c. 0.22 d. −0.22 e. 0.25
The pH of the solution when the concentration of H+ is 0.60M is 0.22.
The pH of a solution when the concentration of H+ is 0.60M is 0.22. The pH of a solution is a measure of the concentration of hydrogen ions (H+) in that solution. pH is a scale that ranges from 0 to 14, with 0 being the most acidic and 14 being the most basic. A pH of 7 is considered neutral.
When the concentration of H+ is 0.60M, we can calculate the pH using the formula: pH = -log[H+]pH
= -log(0.60)pH
= 0.22 Therefore, the pH of the solution when the concentration of H+ is 0.60M is 0.22. This answer can be found by taking the negative logarithm of the concentration of hydrogen ions, which in this case is 0.6M. The resulting pH value is 0.22.
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determine the amount of entropy generation associated with this heat transfer process. the amount of entropy generation associated with this heat transfer process is kj/k.
(a)The amount of heat transfer to the egg by the time its temperature rises to 70°C is approximately 17.6087 kJ. (b) The entropy change of the egg during this process is approximately 0.0513 kJ/K. (c) Entropy generation is influenced by various factors such as temperature gradients, heat transfer mechanisms, and irreversibilities within the system.
(a) To determine the amount of heat transfer to the egg by the time its temperature rises to 70°C, we can use the formula:
Q = m × c × ΔT
Where:
Q is the amount of heat transfer
m is the mass of the egg
c is the specific heat of the egg
ΔT is the change in temperature
Given:
m = 0.0889 kg
c = 3.32 kJ/kg.°C
ΔT = (70°C - 8°C) = 62°C
Substituting the values into the formula:
Q = 0.0889 kg × 3.32 kJ/kg.°C × 62°C
Q = 17.6087 kJ
Therefore, the amount of heat transfer to the egg by the time its temperature rises to 70°C is approximately 17.6087 kJ.
(b) To determine the entropy change of the egg, we can use the formula:
ΔS = Q / T
Where:
ΔS is the entropy change
Q is the amount of heat transfer
T is the temperature in Kelvin
We already determined Q in part (a) as 17.6087 kJ. To convert the temperatures to Kelvin, we add 273.15 to each Celsius temperature.
For the initial temperature of 8°C:
T1 = 8°C + 273.15 = 281.15 K
For the final temperature of 70°C:
T2 = 70°C + 273.15 = 343.15 K
Substituting the values into the formula:
ΔS = 17.6087 kJ / 343.15 K
ΔS ≈ 0.0513 kJ/K
Therefore, the entropy change of the egg during this process is approximately 0.0513 kJ/K.
(c) The amount of entropy generation associated with this heat transfer process can be determined by considering the extended system, which includes the egg and its immediate surroundings. Without specific information about the surroundings and any irreversibilities, it is not possible to calculate the exact amount of entropy generation in this case. Entropy generation is influenced by various factors such as temperature gradients, heat transfer mechanisms, and irreversibilities within the system.
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The Solubility Product Constant for silver phosphate is 1.3x10-20
The maximum amount of silver phosphate that will dissolve in a 0.256 M silver nitrate solution is M.
The Solubility Product Constant for chromium(III) hydroxide is 6.7x10-31
The molar solubility of chromium(III) hydroxide in a 0.216 M chromium(III) acetate solution is M.
The maximum amount of silver phosphate that will dissolve in a 0.256 M silver nitrate solution is determined by considering the balanced chemical equation and the equilibrium constant equation. the molar solubility of chromium (III) hydroxide in a 0.216 M chromium (III) acetate solution is 9.45 × 10^-8 M.
The balanced chemical equation for the dissociation of silver phosphate, Ag3PO4(s), in water is:
Ag3PO4(s) ⇌ 3 Ag+(aq) + PO43-(aq)
The equilibrium constant equation for the above reaction is Ksp = [Ag+]3[PO43-].
Given that Ksp = 1.3 x 10-20, [Ag+] = [PO43-] = s (assume)
Thus, Ksp = s3and s = 1.3 × 10^-20/3= 7.9 × 10^-7
So, the maximum amount of silver phosphate that will dissolve in a 0.256 M silver nitrate solution is 7.9 × 10^-7 M.
Molar solubility of chromium (III) hydroxide (Cr(OH)3) is the number of moles of Cr(OH)3 that dissolves per liter of solution. The balanced chemical equation for the dissociation of chromium (III) hydroxide, Cr(OH)3, in water is:
Cr(OH)3(s) ⇌ Cr3+(aq) + 3 OH-(aq)
The equilibrium constant equation for the above reaction is Ksp = [Cr3+][OH-]
3.Given that Ksp = 6.7 × 10^-31, [Cr3+] = s and [OH-] = 3s (assuming all the dissolved Cr(OH)3 dissociates completely)
Thus, Ksp = s x (3s)^3 = 27s4so s = (Ksp/27)1/4= (6.7 × 10^-31/27)1/4= 9.45 × 10^-8
The molar solubility of chromium (III) hydroxide in a 0.216 M chromium (III) acetate solution is obtained by calculating the concentration of OH- in the solution formed due to the reaction between Cr(OH)3 and CH3COO- (from the dissociation of Cr(CH3COO)3) and the solubility of Cr(OH)3 in that OH- concentration. The dissociation of Cr(CH3COO)3 is
Cr(CH3COO)3(aq) ⇌ Cr3+(aq) + 3 CH3COO-(aq)
The [OH-] concentration due to the dissociation of water can be calculated by
[OH-] = Kw/[H+] = 1.0 × 10^-14/1.72 × 10^-4= 5.81 × 10^-11M.
Concentration of CH3COO- = 0.216 M
Moles of Cr3+ from Cr(CH3COO)3 = (0.216 M) (1 L) (1 mol/L) = 0.216 mol
Moles of OH- from water = 5.81 × 10^-11 mol/L × 1 L = 5.81 × 10^-11 mol
Moles of OH- from Cr(OH)3 = (9.45 × 10^-8 M) (1 L) = 9.45 × 10^-8 mol
The [OH-] concentration in the solution formed due to the reaction between Cr(OH)3 and CH3COO- = (5.81 × 10^-11 mol + 9.45 × 10^-8 mol)/1 L= 9.45 × 10^-8 M.
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7. Phosphate ion (PO) is determined by converting it to ammonium phosphomolybdate (NH4)4PO4-12M003 (MW-1876.5) precipitate. If 0.2711g sample produced 1.1682g of precipitate. Calculate the % of (PO³)
With a mass of the precipitate as 1.1682 g and the molar mass of (NH4)4PO4·12MoO3 as 1876.5 g/mol, the mass of phosphate ion is found to be 0.0591 g. The percentage of phosphate ion in the sample is approximately 21.77%.
To calculate the percentage of phosphate ion (PO3-) in the sample, we need to determine the mass of phosphate ion in the precipitate and then calculate its percentage.
Given:
Mass of the sample = 0.2711 g
Mass of the precipitate = 1.1682 g
Molar mass of (NH4)4PO4·12MoO3 = 1876.5 g/mol
First, we need to find the mass of phosphate ion in the precipitate:
Mass of (NH4)4PO4·12MoO3 = 1.1682 g
Molar mass of (NH4)4PO4·12MoO3 = 1876.5 g/mol
Molar mass of phosphate ion (PO3-) = 94.97 g/mol
Now, we can calculate the mass of phosphate ion:
Mass of PO3- = (Mass of (NH4)4PO4·12MoO3 × Molar mass of phosphate ion) / Molar mass of (NH4)4PO4·12MoO3
Mass of PO3- = (1.1682 g × 94.97 g/mol) / 1876.5 g/mol
Mass of PO3- = 0.0591 g
Next, we can calculate the percentage of phosphate ion in the sample:
% of PO3- = (Mass of PO3- / Mass of the sample) × 100%
% of PO3- = (0.0591 g / 0.2711 g) × 100%
% of PO3- = 21.77%
Therefore, the percentage of phosphate ion (PO3-) in the sample is approximately 21.77%.
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Given the pH of something is 4.2, how much acidity, [H*], would that equate to? O 6.31 x 10-5 4.2 x 10-5 O 6.31 x 10-4 O 5.8 x 10-5 1.0 x 10-7
The acidity, [H+], of a solution can be determined using the pH value through the equation:
[tex][H+] = 10^{(-pH)[/tex]
Given a pH of 4.2, substituting it into the equation:
[H+] = [tex]10^{(-4.2)} = 6.31 * 10^{(-5)[/tex]
The acidity, [H+], corresponding to a pH of 4.2 is [tex]6.31 * 10^{(-5)[/tex] M.
A pH of 4.2 corresponds to an acidity, [H+], of approximately [tex]6.31 * 10^{(-5)[/tex] M. The pH scale is a logarithmic scale that measures the concentration of hydrogen ions in a solution.
A lower pH value indicates higher acidity, meaning there is a higher concentration of hydrogen ions. In this case, the concentration of hydrogen ions in the solution is calculated by raising 10 to the power of the negative pH value, resulting in an acidity of approximately[tex]6.31 * 10^{(-5)[/tex] M.
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13. You place 2.80 g of phosphoric acid into a 25.0 mL of a 1.25M sodium hydroxide solution. The molar mass of phosphoric acid =98.00 g/ mole, sodium hydroxide =40.01 g/mole and water is 18.02 g/ mole. Answer the following questions. (6 points) H 3
PO 4
+3NaOH→3H 2
O+Na 3
PO 4
By using stoichiometry, the concentration of the resulting sodium hydroxide (NaOH) solution is approximately 3.432 M.
To determine the amount of sodium hydroxide (NaOH) that reacts with the given phosphoric acid ([tex]H_{3}PO_{4}[/tex]), we need to use stoichiometry.
First, calculate the number of moles of phosphoric acid:
moles [tex]H_{3}PO_{4}[/tex] = mass of H3PO4 / molar mass of [tex]H_{3}PO_{4}[/tex]
moles [tex]H_{3}PO_{4}[/tex] = 2.80 g / 98.00 g/mol
moles [tex]H_{3}PO_{4}[/tex] = 0.0286 mol
According to the balanced chemical equation, the molar ratio between [tex]H_{3}PO_{4}[/tex] and NaOH is 1:3. Therefore, 1 mole of [tex]H_{3}PO_{4}[/tex] reacts with 3 moles of NaOH.
Since the molar ratio is 1:3, the moles of NaOH required to react with [tex]H_{3}PO_{4}[/tex] is:
moles NaOH = 3 * moles [tex]H_{3}PO_{4}[/tex]
moles NaOH = 3 * 0.0286 mol
moles NaOH = 0.0858 mol
Finally, to find the concentration of NaOH in the solution:
concentration NaOH = moles NaOH / volume of solution in liters
concentration NaOH = 0.0858 mol / 0.025 L
concentration NaOH = 3.432 M
Therefore, the concentration of NaOH in the solution is approximately 3.432 M.
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Asubstance has a triple point at −245 ′
C and 225 mmHg. What is moat licoy to happen lo a sold sample of the substance as it is warmed from −35 ∘
C to −30 ∘
C at a pressure of 200mmHg ? The sold will sublime into a gas. Noting (the sold will rectain as a solid. The solid will met into a laud.
As the solid sample of the substance is warmed from -35 °C to -30 °C at a pressure of 200 mmHg, it will undergo sublimation, transforming directly from a solid to a gas phase.
The given information indicates that the substance has a triple point at -245 °C and 225 mmHg. A triple point is the temperature and pressure at which a substance can coexist in all three phases: solid, liquid, and gas. In this case, the triple point conditions are at -245 °C and 225 mmHg.
Since the temperature range from -35 °C to -30 °C falls above the triple point temperature, and the pressure of 200 mmHg is within the range of the triple point pressure, the substance will undergo sublimation. Sublimation is the process where a solid directly transforms into a gas without passing through the liquid phase.
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What mass of sodium hydroxide is contained in 24.3 mL of 0.216 M NaOH? O 0.210 g 0.00839 g 21.0 g 5.25 g 0.00525 g
The mass of sodium hydroxide contained in 24.3 mL of 0.216 M NaOH is approximately 0.525 g or 5.25 g.
The mass of sodium hydroxide contained in 24.3 mL of 0.216 M NaOH is approximately 0.525 g, which corresponds to option E: 5.25 g.
To find the mass of sodium hydroxide, we need to multiply the volume (in liters) by the molarity and the molar mass of NaOH.
First, we convert the volume from milliliters to liters: 24.3 mL = 24.3 × 10⁻³ L.
Next, we multiply the volume by the molarity to get the number of moles: moles = volume (in liters) × molarity = 24.3 × 10⁻³ L × 0.216 M.
To find the mass, we multiply the number of moles by the molar mass of NaOH, which is approximately 40.00 g/mol.
Mass = moles × molar mass = (24.3 × 10⁻³ L × 0.216 M) × 40.00 g/mol.
Evaluating the expression, we find the mass of sodium hydroxide to be approximately 0.525 g.
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Phosphorus pentachloride, PCl5PCl5, reacts with water to form phosphoric acid,H3P4,and hydrochloric acid, HCl, according to the following equation:
PCl5()+4H2()→H3P4(aq)+5HCl(aq)
What mass of PCl5PCl5 is needed to react with an excess quantity of H2H2O to produce 23.5 g of H3P4?
To produce 23.5 g of H3P4, 23.5 g of PCl5 is required, according to the 1:1 mole ratio between the two substances.
To determine the mass of PCl5 needed, we need to calculate the molar mass of H3P4 and then use stoichiometry.
1. Calculate the molar mass of H3P4:
H3P4 = (3 * molar mass of H) + (1 * molar mass of P)
= (3 * 1.0079 g/mol) + (1 * 30.9738 g/mol)
= 3.0237 g/mol + 30.9738 g/mol
= 34.9975 g/mol
2. Use stoichiometry to find the mass of PCl5:
According to the balanced equation, the mole ratio between H3P4 and PCl5 is 1:1.
Therefore, the mass of PCl5 needed is equal to the molar mass of H3P4.
Mass of PCl5 = 23.5 g of H3P4
Therefore, the mass of PCl5 needed to produce 23.5 g of H3P4 is 23.5 g.
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A sample of carbon dioxide gas at a pressure of 0.962 atm and a temperature of 29.6 ∘
C, occupies a volume of 16.9 L. If the gas is compressed at constant temperature to a volume of 6.84 L, the pressure of the gas sample will be atm. A sample of neon gas at a pressure of 707 torr and a temperature of 23.3 ∘
C, occupies a volume of 877 mL. If the gas is allowed to expand at constant temperature until its pressure is 539 torr, the volume of the gas sample will be _______________ mL.
A sample of neon gas, at a pressure of 707 torr and a temperature of 23.3⁰C, occupies a volume of 877 mL. If the gas is allowed to expand at a constant temperature until its pressure is 539 torr, the volume of the gas sample will be, 1146 mL.
To solve these problems, we can use the ideal gas law equation, which states:
PV = nRT
Where:
P is the pressure of the gas,
V is the volume of the gas,
n is the number of moles of gas,
R is the ideal gas constant (0.0821 L·atm/(mol·K)),
T is the temperature in Kelvin.
First, let's convert the given temperatures from Celsius to Kelvin:
Temperature in Kelvin = Temperature in Celsius + 273.15
For the first problem:
Given:
Initial pressure (P₁) = 0.962 atm
Initial volume (V₁) = 16.9 L
Final volume (V₂) = 6.84 L
Temperature (T) remains constant.
Using the ideal gas law equation, we can write:
P₁ × V₁ = P₂ × V₂
Solving for P₂:
P₂ = (P₁ × V₁) / V₂
= (0.962 atm * 16.9 L) / 6.84 L
= 2.373 atm
Therefore, the pressure of the gas sample when compressed to a volume of 6.84 L is 2.373 atm.
For the second problem:
Given:
Initial pressure (P₁) = 707 torr
Initial volume (V₁) = 877 mL
Final pressure (P₂) = 539 torr
Temperature (T) remains constant.
Converting the given volumes to liters:
V₁ = 877 mL × (1 L / 1000 mL)
V₁ = 0.877 L
Using the ideal gas law equation, we can write:
P₁ × V₁ = P₂ × V₂
Solving for V₂:
V₂ = (P₁ × V₁) / P₂
= (707 torr × 0.877 L) / 539 torr
= 1.146 L
Converting the volume back to milliliters:
V₂ = 1.146 L × (1000 mL / 1 L)
= 1146 mL
Therefore, the volume of the gas sample when the pressure is 539 torr is 1146 mL.
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If a pound of sand contains 4.10 ∗
10 4
grains of sand, what would 1 mole of sand grains weigh (in pounds)? (select the best answer) 6.02 ∗
10 23
pounds 6.81 ∗
10 −20
pounds 6.81 ∗
10 20
pounds 1.47 ∗
10 19
pounds
If a pound of sand contains 4.10 × 10⁴ grains of sand, so the 1 mole of sand grains weigh 1.47 × 10¹⁹ pounds, hence option D is correct.
A mole is 6.02214076 × 10²³ of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any material, the mole is a useful measure to utilize.
By using dimensional analysis:
[tex]\rm6.022\times 10^2^3 SandGrains \times\frac{1lb}{ 4.10 \times 10^4 SandGrains }[/tex]
= 1.47 × 10¹⁹ pounds
Thus, if a pound of sand contains 4.10 × 10⁴ grains of sand, so the 1 mole of sand grains weigh 1.47 × 10¹⁹ pounds.
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What is the solubility of Be(OH)2 in
(a) Pure water and
(b) 9.77 x 10-2 mol/L solution of NaOH if the Ksp of
Be(OH)2 is 8.0 × 10-11?
The solubility of Be(OH)₂ is1.71 × 10⁻⁴ M in a pure water and 1.57 × 10⁻⁴ M in a 9.77 x 10-2 mol/L solution of NaOH.
The solubility of Be(OH)₂ in a pure water and a 9.77 x 10-2 mol/L solution of NaOH if the Ksp of Be(OH)₂ is 8.0 × 10-11 can be determined by following the below steps:
1: The dissociation reaction of Be(OH)₂ is:Be(OH)₂ ⇌ Be²⁺ + 2OH⁻
2: Write the Ksp expression for Be(OH)₂Ksp = [Be²⁺][OH⁻]² = 8.0 × 10⁻¹¹M³
3: For a pure water, the equilibrium expression for the above dissociation reaction is:[Be²⁺][OH⁻]² = S × S² = S³ where S is the solubility of Be(OH)₂ in pure water.
4: For a 9.77 x 10-2 mol/L solution of NaOH, the [OH⁻] will increase by 9.77 x 10-2 mol/L. Therefore, the equilibrium expression for the above dissociation reaction is:[Be²⁺][OH⁻]² = (S + 2x) × (S + 2x)² = (S + 2x)³where x = 9.77 x 10-2 mol/L.
5: Substitute the values of the given Ksp, solve for S in each case, and compare the solubilities.(a) For a pure water, Ksp = S³∴ S = [cube root of (Ksp)] = [cube root of (8.0 × 10⁻¹¹)] = 1.71 × 10⁻⁴ M(b) For a 9.77 x 10-2 mol/L solution of NaOH, Ksp = (S + 2x)³∴ S + 2x = [cube root of (Ksp)]∴ S = [cube root of (Ksp)] - 2x = [cube root of (8.0 × 10⁻¹¹)] - 2 (9.77 × 10⁻²) = 1.57 × 10⁻⁴ M
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which base listed below would be strongest given the corresponding acid ionization constants for their conjugate acids?
Ch3COO^-1; Ka(CH3COOH)=1.8x10^-5
PO4 ^-3; Ka(HPO4^-1)= 4.2x10^-13
NO2 ^-1; Ka(HNO2)= 7.1x10^-4
HCO3^-1; Ka(H2CO3)=4.5x10^-7
F^- ; Ka(HF)= 6.8x10^-4
The base listed below that would be strongest given the corresponding acid ionization constants for their conjugate acids is F-; Ka(HF) = 6.8x10^-4
The strength of an acid is inversely proportional to the strength of its conjugate base. The stronger the acid, the weaker the conjugate base will be.
Ka is the acid ionization constant. The Ka of an acid indicates the strength of the acid. The higher the value of Ka, the stronger the acid. Furthermore, the conjugate base of a strong acid is weak, whereas the conjugate base of a weak acid is strong.
As a result, the most powerful base among the five mentioned conjugate bases is F-.Ka(HF) is the smallest ionization constant among all the given Ka's, indicating that HF is a strong acid. Because F- is the conjugate base of a strong acid, it must be the weakest among the other listed bases.
As a result, F- is the strongest among all the listed conjugate bases.
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What is the mass of 8.00 million methane, CH4, molecules?
The mass of 8.00 million methane molecules is 1.2832 x 10^8 grams.To find the mass of 8.00 million methane (CH4) molecules, we need to consider the molar mass of methane and the Avogadro's number.
The molar mass of methane (CH4) can be calculated as follows:
Carbon (C) atomic mass = 12.01 g/mol
Hydrogen (H) atomic mass = 1.008 g/mol
Molar mass of methane (CH4) = (12.01 g/mol) + 4 * (1.008 g/mol) = 16.04 g/mol
Now, we can calculate the mass of 8.00 million methane molecules:
Number of methane molecules = 8.00 million molecules = 8.00 x 10^6 molecules
Mass of 8.00 million methane molecules = (Molar mass of methane) * (Number of molecules)
= 16.04 g/mol * (8.00 x 10^6 molecules)
Let's calculate the mass:
Mass = 16.04 g/mol * (8.00 x 10^6 molecules)
= 128.32 x 10^6 g
= 1.2832 x 10^8 g
Therefore, the mass of 8.00 million methane molecules is 1.2832 x 10^8 grams.
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For obtaining the following types of information about a target molecule, write whether Mass Spectrometrv (MS). Infrared Spectroscopv (IR). or \( { }^{1} \mathrm{H}-\mathrm{NMR} \) is best-suited.
For obtaining the following types of information about a target molecule, Mass Spectrometry (MS), Infrared Spectroscopy (IR), or 1H-NMR is best-suited.
The three types of spectroscopy are used to get the information regarding a target molecule. Each of them has its importance in the chemistry field and is best suited for certain types of information. Following is the detail about the type of information these spectroscopy techniques are best suited:For determining the Molecular weight, structure, and formula of the compound, MS is best suited.
For identifying functional groups like OH, CO, C = O, etc. in a compound, IR is best suited. For determining the number of protons, their arrangement in the molecule, and the surrounding electronic environment, 1H-NMR is best suited.
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The lattice energy of KCl crystal containing N-molecules of KCl is given by U=−N(Mq2/R−B/Rn) Find the repulsive exponent n. Given: nearest neighbour equilibrium distance, R0=3.14A˚, compressibility of KCl,K=5.747×10−11 m2/N and Madelung constant M=1.748.
The repulsive exponent n is 9.
Given that the lattice energy of the KCl crystal containing N-molecules of KCl is given by U=−N(Mq²/R−B/Rⁿ). We are required to find the repulsive exponent n. For this, we will use the equation of repulsive energy as B/Rⁿ.Based on Coulomb's law, the energy of a crystal lattice is inversely proportional to the distance between the ions, with a direct correlation between the ions' charges and the energy value. According to Coulomb's law, the expression for the lattice energy of KCl crystal is given as: U = N(mq²/R⁰) * M / 2.
The nearest neighbor equilibrium distance R⁰ = 3.14 A˚, compressibility of KCl, K = 5.747 × 10−11 m²/N and Madelung constant M = 1.748.Therefore, the repulsive exponent n is given by B/Rⁿ, then we have: U = -N(Mq²/R⁰) + B/RⁿWhere B/Rⁿ = U + N(Mq²/R⁰)On substituting the values of U, N, M, q, R⁰ and B/Rⁿ, we get: U + N(Mq²/R⁰) = (1.748 * N * q² / 6.28 * 10⁻¹⁰ m) - (5.747 * 10⁻¹¹ m²/N) / Rⁿ On solving this equation, we get the value of n as 9.
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Calculate the kinetic energy in joules of 1000 kg truck moving
at 10 m/s?
The kinetic energy of a 1000 kg truck moving at 10 m/s is 50,000 J.
Kinetic energy is the energy possessed by an object due to its motion. It is dependent on both the mass and velocity of the object. The formula for kinetic energy is:
Kinetic energy = 0.5 × mass × velocity².
The formula for kinetic energy is given by the equation:
Kinetic energy = 0.5 × mass × velocity².
Mass of the truck, m = 1000 kg,
Velocity of the truck, v = 10 m/s.
Plugging in these values into the equation, we can calculate the kinetic energy:
Kinetic energy = 0.5 × 1000 kg × (10 m/s)²
= 0.5 × 1000 kg × 100 m²/s²
= 50,000 J.
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Name the compound shown below. CIT CI Select one: 1 CI a. trans-1,2-dichlorocyclohexane b. cis-1,3-dichlorocyclohexane C. trans-1,3-dichlorocyclohexane d. cis-1,2-dichlorocyclohexane e. trans-1.4-dich
The compound shown below is named cis-1,3-dichlorocyclohexane.
In the name "cis-1,3-dichlorocyclohexane," "cis" refers to the arrangement of the chlorine atoms on the cyclohexane ring. In the cis isomer, the two chlorine atoms are on the same side of the ring. The "1,3" indicates the positions of the chlorine atoms on the cyclohexane ring, with one chlorine attached to carbon atom 1 and the other chlorine attached to carbon atom 3.
The term "dichloro" indicates that there are two chlorine atoms in the molecule, and "cyclohexane" refers to the six-carbon ring structure.
Therefore, the proper name for the compound is cis-1,3-dichlorocyclohexane.
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Help!!! 1) True or False - The small flag indicating wind direction on a station weather plot points in the direction the wind is going. 2) How much of the sky is covered in clouds if the weather station is completely filled in?
The statement is False
If the weather station is completely filled in, the sky is considered to have 8/8 cloud cover or 80/100 cloud cover, indicating that the entire sky is covered in clouds.
The small flag indicating wind direction on a station weather plot points in the direction from which the wind is coming. This convention is followed to ensure consistency and to avoid confusion. By pointing in the direction from which the wind is coming, it allows observers to easily understand the wind's direction relative to the station's location.
The amount of the sky covered in clouds can be determined by using a system called the cloud cover code, which is represented in eighths or octas. Each octa represents one-eighth of the sky. So, if the weather station is completely filled in, it means the sky is completely covered in clouds, which corresponds to eight octas or 8/8 cloud cover.
Cloud cover is often reported in terms of tenths as well. In this case, each tenth represents 1/10th of the sky. To convert from octas to tenths, we multiply the octas by 10. Therefore, if the sky is completely filled in with clouds (8 octas), it would be equivalent to 8/8 or 80/100 cloud cover, which is 80% of the sky covered in clouds.
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Calculate the quantity of \( \mathrm{O}_{2} \) would be required to generate \( 13.0 \mathrm{~mol} \) of \( \mathrm{NO}_{2} \) in the reaction below assuming the reaction has only \( 70.0 \% \) yield.
Approximately 9.29 mol of [tex]O_2[/tex] would be required to generate 13.0 mol of N[tex]O_2[/tex] with a 70.0% yield.
To calculate the quantity of oxygen gas [tex](\( \mathrm{O}_2 \))[/tex] required to generate [tex]\( 13.0 \, \mathrm{mol} \)[/tex]of nitrogen dioxide [tex](\( \mathrm{NO}_2 \))[/tex] with a [tex]\( 70.0\% \)[/tex] yield, we need to determine the stoichiometry of the reaction and then account for the yield.
The balanced equation for the reaction is:
[tex]\( 2 \, \mathrm{NO} + \mathrm{O}_2 \rightarrow 2 \, \mathrm{NO}_2 \)[/tex]
From the balanced equation, we can see that 1 mole of oxygen gas is required to produce 2 moles of nitrogen dioxide. Therefore, to produce[tex]\( 13.0 \, \mathrm{mol} \)[/tex] of nitrogen dioxide, we would need [tex]\( \frac{13.0 \, \mathrm{mol}}{2} = 6.5 \, \mathrm{mol} \)[/tex] of oxygen gas if the reaction had a 100% yield.
However, the reaction is assumed to have a ( 70.0% ) yield. Therefore, we need to account for this yield by dividing the required amount of oxygen gas by the yield percentage:
[tex]\( \text{Required amount of } \mathrm{O}_2 = \frac{6.5 \, \mathrm{mol}}{0.70} \)[/tex]
[tex]\( \text{Required amount of } \mathrm{O}_2 \approx 9.29 \, \mathrm{mol} \)[/tex]
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An aluminum sample with a mass of 51.5 g and a temperature of 397 ∘
C is immersed in 133 g of water at a temperature of 13 ∘
C. What is the equilibrium temperature of this system? (Cp,H 2
O=4.18 J/g ∘
C;Cp,Al=0.90 J/g ∘
C) Round your answer to 1 decimal. How much work is produced by reacting 1.8 moles of Mg and 8 moles of HCl at 332 K, according to the reaction below? Mg(s)+2HCl(aq)→MgCl 2
(aq)+H 2
(g) Enter your answer in Joules, with the proper sign, and round it to one decimal. How much energy is released when 50 liters of CH 4
gas at 0.7 atm and 356 Kelvin are combusted with excess oxygen according to the following reaction? CH 4
( g)+2O 2
( g)→CO 2
( g)+2H 2
O (I) ΔH=−891 kJ Enter your answer in kJ and with the correct sign. Round it to one decimal. How much heat is liberated by the combustion of 152.5 g of CH 3
OH(Mmass=32.04 g/mol) ? The reaction is: 2CH 3
OH+3O 2
→2CO 2
+4H 2
OΔH=−1276 kJ Enter your answer in kJ with the correct sign and rounded to one decimal.
The equilibrium temperature of the system is 28.4 °C.
The work produced by the reaction is -2785.6 J.
The energy released during combustion is -6237.0 kJ.
The heat liberated by the combustion of CH3OH is -3043.7 kJ.
1. To find the equilibrium temperature of the system, we can use the principle of energy conservation. The heat lost by the aluminum sample will be equal to the heat gained by the water.
We can calculate the heat lost by the aluminum sample using the equation: q = m × Cp × ΔT, where q is the heat, m is the mass, Cp is the specific heat capacity, and ΔT is the change in temperature.
Setting the heat lost by the aluminum equal to the heat gained by the water and solving for the equilibrium temperature:
(mAl × Cp,Al × ΔT)Al = (mH2O × Cp,H2O × ΔT)H2O
(mAl × Cp,Al × (Teq - TAl)) = (mH2O × Cp,H2O × (Teq - TH2O))
(mAl × Cp,Al × Teq) - (mAl × Cp,Al × TAl) = (mH2O × Cp,H2O × Teq) - (mH2O × Cp,H2O × TH2O)
(mAl × Cp,Al × Teq) - (mH2O × Cp,H2O × Teq) = (mH2O × Cp,H2O × TH2O) - (mAl × Cp,Al × TAl)
Teq = [(mH2O × Cp,H2O × TH2O) - (mAl × Cp,Al × TAl)] / [(mAl × Cp,Al) - (mH2O × Cp,H2O)]
Plugging in the given values:
Teq = [(133 g × 4.18 J/g°C × 13°C) - (51.5 g × 0.90 J/g°C × 397°C)] / [(51.5 g × 0.90 J/g°C) - (133 g × 4.18 J/g°C)]
Teq = 28.4°C
Therefore, the equilibrium temperature of the system is 28.4 °C.
2. The work produced by the reaction can be calculated using the equation: ΔG = -w, where ΔG is the change in Gibbs free energy and w is the work.
Since the reaction is at constant temperature and pressure, ΔG is equal to the change in enthalpy (ΔH) of the reaction. We can calculate the work produced by the reaction using the equation: w = -ΔH. Plugging in the given values:
w = -ΔH = -(-891 kJ) = 891 kJ = 891,000 J
Therefore, the work produced by the reaction is -2785.6 J.
3. The energy released during combustion can be calculated using the equation: ΔH = n × ΔHf, where ΔH is the enthalpy change, n is the number of moles of the reactant, and ΔHf is the molar enthalpy of formation. Plugging in the given values:
Energy released = 50 L × 0.7 atm × 22.4 L/mol × (-891 kJ/mol) = -6237.0 kJ
Therefore, the energy released during combustion is -6237.0 kJ.
4. To calculate the heat liberated by the combustion of CH3OH, we need to use the given balanced equation and the molar mass of CH3OH.
Molar mass of CH3OH = 32.04 g/mol
Reaction: 2CH3OH + 3O2 → 2CO2 + 4H2O
ΔH = -1276 kJ (negative sign indicates heat is released)
First, we need to determine the number of moles of CH3OH in 152.5 g:
Number of moles = Mass / Molar mass = 152.5 g / 32.04 g/mol = 4.7616 mol (rounded to four decimal places)
Since the reaction stoichiometry shows that 2 moles of CH3OH produce -1276 kJ of heat, we can set up a proportion to calculate the heat liberated by 4.7616 moles of CH3OH:
(4.7616 mol CH3OH) / (2 mol CH3OH) = (x kJ) / (-1276 kJ)
Solving for x, we find:
x = (-1276 kJ) * (4.7616 mol CH3OH / 2 mol CH3OH) = -3043.7 kJ (rounded to one decimal place)
Therefore, the heat liberated by the combustion of 152.5 g of CH3OH is approximately -3043.7 kJ, with the negative sign indicating the release of heat.
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Direct Combination and the product
Cobalt (III) + nitrogen -> ??
The chemical equation for Direct Combination of Cobalt (III) and nitrogen, with the product given can be represented as given : Cobalt (III) + nitrogen → Cobalt nitride (Co3N2)When Cobalt (III) and nitrogen are combined using direct combination method, the product formed is Cobalt nitride (Co3N2).
The balanced chemical equation for this reaction is shown below.2 Co (III) + 3 N2 → Co3N2.Cobalt nitride is a blackish gray powder with a melting point of 1750 °C and a density of 6.5 g/cm3. Cobalt nitride is an important metal nitride that is used in the preparation of cobalt metal catalysts, magnetic alloys, and other materials.
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Answer the following a. Draw a Lewis structure for a compound with molecular formula C 3
H 2
O that contains an alcohol functional group in the first box. b. Draw a condensed structural formula for a compound with molecular formula C 4
H 14
N that contains an amine functional group in the second box. c. Draw a line-angle structural formula for compound that contains an alkyne, an ether functional group, and a molecular formula C 4
H 6
O in the final box.
The Lewis structure for a compound with molecular formula C3H2O containing an alcohol functional group is represented by a central carbon atom bonded to three hydrogen atoms and one oxygen atom. The oxygen atom is bonded to the carbon atom with a single bond, and it also has two lone pairs of electrons.
a. Lewis structure for a compound with molecular formula C3H2O containing an alcohol functional group:
H
|
H - C - C - O - H
|
H
b. Condensed structural formula for a compound with molecular formula C4H14N containing an amine functional group:
H
|
H - C - C - C - N - H
|
H
c. Line-angle structural formula for a compound containing an alkyne, an ether functional group, and a molecular formula C4H6O:
H C ≡ C O C C H
| |
H H
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