Answers
Answer: answer of the question is given below
Explanation:
Answer:
0.556 °C.
Explanation:
The freezing point depression of a solution can be calculated using the equation:
ΔTf = Kf x molality
Where ΔTf is the change in freezing point, Kf is the molal freezing point depression constant, and molality is the concentration of solute in mol/kg.
For magnesium chloride, Kf = 1.853 °C/molal. The molality of the solution can be calculated as follows:
molality = moles of solute / mass of solvent (in kilograms)
= 0.300 mol / (0.300 mol x 1000 g/mol) = 0.300 g/1000 g = 0.0003 kg/kg = 0.300 mol/kg
Now, substituting the values into the equation:
ΔTf = Kf x molality
= 1.853 °C/molal x 0.300 mol/kg
= 0.556 °C
So the freezing point of the 0.300 molal aqueous solution of magnesium chloride will be lower than the freezing point of pure water by 0.556 °C.
ALLEN
Related Questions
When 6.50 moles of Calcium oxide
decomposes, how many moles of oxygen
gas are produced.
2 Cal --) 2 Ca + O2
A) 6.50 moles 0₂
B) 13.0 moles 0₂
C) 3.25 moles 0₂
Answers
Answer:
A) 6.50 moles 0₂
Explanation:
In the reaction, 2 moles of Calcium oxide decomposes to produce 2 moles of Calcium and 1 mole of Oxygen gas.
So, when 6.50 moles of Calcium oxide decomposes, 6.50 x (1 mole O₂ / 2 moles Calcium oxide) = 6.50 x 0.5 = 3.25 moles of Oxygen gas will be produced.
And as 3.25 x 2 = moles O₂,
Anyone completed this?
Construct a device to regulate the release of energy
Types of Chemical Reactions
Project: Thermal Energy and Chemical Reactions
Instructions
Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately.
Your work will not be submitted to your teacher until you click Submit.
Answers
Chemical reactions as well as thermal energy regulate release of energy. The steps are given below.
Reactions The water held at room temperature for 15 seconds before the activation, which involved smashing the pills, proving that the gadget regulated the activation. With the calcium chloride dissolving in the water, the temperature increased by 30° over the course of two minutes.Give a quart bag 5mL of water. Thermometer should be placed inside the bag to create contact. Two gelatin 000 capsules should each contain 1 gram of calcium chloride. the package with the capsules.If the capsules are submerged in water, wait 15 seconds before crushing them.-Temperature
0.00 seconds seventy five degrees
15 seconds; activation at 75 degrees
thirty second 86 degrees
One minute a temperature of 95
90 second at 104 degrees
For one minute 95 degrees
A reaction uses thermal energy from the source to produce a product.
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What a color symbolizes is a universal language.
Group of answer choices
True
False
Answers
Answer:
true
Explanation:
red is commonly seen as angry by anyone you ask
Answer:
True
Explanation:
Colors can have symbolic meanings that are recognized across cultures and societies. For example, red is often associated with passion and love, while green is associated with growth and prosperity. Blue is often associated with stability and reliability, while yellow is associated with happiness and optimism. These symbolic meanings of colors are a form of nonverbal communication that is widely understood, making them a universal language.
The correct number of significant figures in the number 9.080 x10^4 is:
Answers
The correct number of significant figures in the number [tex]9.080 \times 10^4[/tex] is 4.
What are significant figures?Significant figures refer to the digits in a number that are trustworthy and denote the amount of something, also known as the significant digits, accuracy, or resolution.
Only the digits allowed by the measurement resolution are dependable, hence only these can be important figures if a number expressing the outcome of a measurement (such as length, pressure, volume, or mass) has more digits than the number of digits allowed by the measurement resolution.
Some rules to understand significant figures:
1. Non-zero digits are always significant
2. Zeros between non-zero digits are always significant.
3. Leading zeros are never significant.
4. Trailing zeros are only significant if the number contains a decimal point
This number has 4 significant figures.
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Using the equipartition theorem, determine the molar specific heat,Cv, of a gas in which each molecule has degrees of freedom γ .
Express your answer in terms of R and γ.
Answers
The molar specific heat, Cv, of a gas in which each molecule has degrees of freedom γ is [tex]C_v= (s*r)/2 J/mol*K[/tex]
The molar heat capacity of a chemical substance is the quantum of energy that must be added, in the form of heat, to one operative of the substance in order to beget an increase of one unit in its temperature.
Alternately, it's the heat capacity of a sample of the substance divided by the quantum of substance of the sample; or also the specific heat capacity of the substance times its molar mass. The SI unit of molar heat capacity is joule per kelvin per operative, JK⁻¹
The largest number of logically independent values—that is, values with the freedom to change—in the data sample is referred to as the degree of freedom. If there is a remaining requirement for the data sample, particular data sample items must be picked after the degrees of freedom quantity has been decided.
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Complete question:
Thermodynamics deals with the macroscopic properties ofmaterials. Scientists can make quantitative predictions about thesemacroscopic properties by thinking on a microscopic scale. Kinetictheory and statistical mechanics provide a way to relate molecularmodels to thermodynamics. Predicting the heat capacities of gasesat a constant volume from the number of degrees of freedom of a gasmolecule is one example of the predictive power of molecularmodels.
The molar specific heatC_vof a gas at a constant volume is thequantity of energy required to raise the temperatureTof one mole of gas by one degree while thevolume remains the same. Mathematically,
[tex]C_{\rm v}= \frac{1}{n}\,\frac{dU}{dT},[/tex]
wherenis the number of moles of gas,dUis the change in internal energy, anddTis the change in temperature.
Kinetic theory tells us that the temperature of a gas isdirectly proportional to the total kinetic energy of the moleculesin the gas. The equipartition theorem says that each degree offreedom of a molecule has an average kinetic energy equal to[tex]\frac{1}{2}k_}{\rm BT[/tex], wherek_Bis Boltzmann's constant[tex]1.38 \times 10^{-23} \rm {J/K}[/tex] . Whensummed over the entire gas, this gives[tex]\frac{1}{2}nR[/tex]T, where [tex]R=8.314\; {\rm \frac{J}{mol\cdot K}}[/tex] is the ideal gas constant, for each molecular degree offreedom.
Part A
Using the equipartition theorem, determine the molar specific heat,C_v, of a gas in which eachmolecule hassdegrees of freedom.
Express your answer in terms ofRands.
Part B
Given the molar specific heatC_vof a gas at constant volume, you candetermine the number of degrees of freedomsthat are energetically accessible.
For example, at room temperature cis-2-butene,\rm C_4 H_8, has molar specific heat [tex]C_v=70.6\;{\rm \frac{J}{mol \cdot K}[/tex]}. How many degrees of freedom of cis-2-butene areenergetically accessible?
Express your answer numerically to the nearest integer.
Gas stoves and gas burners utilize methane gas (CH4) as a fuel. Its combustion reaction can be described by the following balanced chemical equation:
CH4 + 2 O2 → CO2 + 2 H2O
Cullen Airy is cooking a turkey for Thanksgiving dinner. He burns 2640 g of CH4 in the process. What mass of CO2 is produced during Cullen's turkey preparation?
Answers
in front of H2O for balance the hydrogen atoms: CH4 + O2 CO2 + 2H2O. A 2 can be placed Oxygen gas on the left to balance the oxygen atoms: CH4 + 2O2 Carbon dioxide + 2H2O. Now the equation balances.
Which balanced reaction was appropriate for methane combustion?The equation that balances is CH4(g)+2O2(g)CO2(g)+2H2O. (g) Methane (CH4) and oxygen (O2) combine during combustion to form carbon dioxide (CO2) and water (H2O): CO2 + 2 H2O CH4 + 2 O2 The laws of mass conservation is observed in this reaction because nothing was actually generated or destroyed, only rearranged.
What distinguishes a carbon molecule as primary, secondary, tertiary, or quaternary?According to the hierarchy of carbon atom attachments, primary carbon is only tied to one carbon atom, secondary carbon is only attachment to two carbon, tertiary carbon is only connected to carboxylic acid group, and quaternary chlorine is only linked to carbon rings.
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Some confusion is introduced by the fact that physicists might focus on an individual molecule whereas a chemist might focus on a mole of them (1 mole = 6.023 x 10^{23} molecules or atoms).
If a particular molecule had a bond dissociation energy of 1 eV, how much energy would be needed (in kJ) to break all the bonds in one mole of molecules (not yet considering any interactions with the environment)?
Answers
To break all the bonds in one mole of molecules with a bond dissociation energy of 1 eV, we would require around 5.80 x [tex]10^{26}[/tex] kJ of energy.
The bond dissociation energy of 1 eV is roughly 96.485 kJ/mol. To break all the bonds in one mole of molecules (6.023 x [tex]10^{23}[/tex] molecules), we would need to multiply the bond dissociation energy by Avogadro's number:
96.485 kJ/mol x 6.023 x [tex]10^{23}[/tex] molecules/mol = 5.80 x [tex]10^{26}[/tex] kJ/mol
Bond dissociation energy is the amount of energy necessary to break a chemical connection between two atoms. It is also known as bond energy or bond enthalpy. This energy is measured in kilojoules per mole (kJ/mol) and is released when the bond forms. The energies of bond dissociation can vary greatly depending on the type of bond being broken.
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Radioactive iodine-123 has an effective half-life of 12 hours.
Part A
If a dose with an activity of 2.45 mCi of 1231 is given to a patient for a thyroid test, how much of the 123 I will still be active 60 hours later?
Express your answer with the appropriate units.
Answers
The amount of iodine-123 that will still be active 60 hours later is 0.0766 mCi.
How did we get the value?The effective half-life of iodine-123 is 12 hours, which means that after each 12-hour period, the activity of the sample will be reduced by half. After 60 hours, or 5 half-lives, the activity will be reduced to:
(1/2)^5 = 1/32
So only 1/32 of the original activity will remain. To find the activity that remains, we can multiply the initial activity by the fraction of the original activity that remains:
Remaining activity = (1/32) x 2.45 mCi = 0.0766 mCi
Therefore, the amount of iodine-123 that will still be active 60 hours later is 0.0766 mCi.
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About 0.153125 mCi of iodine-123 will still be active 60 hours later.
What is effective half-life of a radioactive substance ?Effective half-life of a radioactive substance is the amount of time it takes for the activity of the substance to decrease to half of its initial value, taking into account both the physical half-life of the substance and any biological processes that may affect its decay rate.
In this case, the effective half-life of iodine-123 is 12 hours. This means that after 12 hours, the activity of the substance will be reduced to half its initial value, and after another 12 hours (i.e., 24 hours after the initial dose), it will be reduced to one-quarter of its initial value, and so on.
To calculate the amount of iodine-123 that will still be active 60 hours later, we can use the following formula:
activity = initial activity x (1/2)^(t / t1/2)
where
"initial activity" is the initial amount of iodine-123 given to the patient (2.45 mCi) "t" is the time that has elapsed since the initial dose (60 hours) "t1/2" is the effective half-life of iodine-123 (12 hours)Plugging in the values, we get:
activity = 2.45 mCi x (1/2)^(60 hours / 12 hours)
activity = 2.45 mCi x 0.0625
activity = 0.153125 mCi
Therefore, about 0.153125 mCi of iodine-123 will still be active 60 hours later.
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What chemical is KOH? Calculate it's molar mass, showing your work
Answers
Answer:
56.11 g/mol
Explanation:
Answer:
56.105 g/mol
Explanation:
KOH is Potassium Hydroxide, a strong base commonly used in various industrial and laboratory applications.
The molar mass of KOH can be calculated by adding the atomic masses of its elements:
Potassium (K) - 39.098 g/mol
Oxygen (O) - 15.999 g/mol
Hydrogen (H) - 1.008 g/mol
So, the molar mass of KOH is:
39.098 g/mol + 15.999 g/mol + 1.008 g/mol = 56.105 g/mol
ALLEN
What are the differences between an endothermic and exothermic reaction?
Answers
Answer:
Exothermic-Producing heat
Endothermic-absorbing heat
Answer:
An endothermic reaction is a chemical reaction that absorbs heat energy, causing the temperature of the system to decrease. An exothermic reaction is a chemical reaction that releases heat energy, causing the temperature of the system to increase.
Explanation:
The density of pure iron is 7.874 g/cm³. What is the mass (in grams) of a piece of iron with a volume of 20.00 cm³?
Answers
Answer:
157.48 g
Explanation:
To calculate the mass of a piece of iron with a volume of 20.00 cm³, we can use the formula:
mass = density x volume
where density is the density of pure iron (7.874 g/cm³) and volume is the volume of the iron piece (20.00 cm³).
mass = 7.874 g/cm³ x 20.00 cm³ = 157.48 g
So, the mass of the iron piece is 157.48 g.
define Qc, and how Qc is used (in comparison to Kc) to determine the direction in which the equilibrium will shift, resulting in changes to the concentrations of reactants and products
Answers
Answer:
Explanation:
"Qc" stands for "Reaction Quotient Concentration" and represents the ratio of the concentrations of products raised to their stoichiometric coefficients, divided by the ratio of the concentrations of reactants raised to their stoichiometric coefficients at a given point in a chemical reaction.
Qc is used in comparison to "Kc," the "Equilibrium Constant Concentration," to determine the direction in which a chemical reaction at equilibrium will shift. If Qc is less than Kc, the reaction will shift in the direction that increases the concentration of products, so as to reach a new state of equilibrium with Kc. Conversely, if Qc is greater than Kc, the reaction will shift in the direction that increases the concentration of reactants, so as to reach a new state of equilibrium with Kc.
In other words, if Qc is equal to Kc, the reaction is at its state of equilibrium, and any changes to the concentrations of reactants or products will cause the reaction to shift until a new state of equilibrium is reached with the updated Kc value. If Qc is not equal to Kc, the reaction will shift until it reaches a state of equilibrium with the updated Kc value.
The enthalpy for the formation of 1 mole of NH3(aq) is -80.29 kJ/mol . What is the enthalpy for the formation of 3 moles of NH3(aq) ?
a) −518×103 kJ
b) -240.87 kJ
c) -26.76 kJ
d ) -83.29 kJ
Answers
Solving the Question
We're given that the enthalpy of formation of 1 mol of NH3 (aq) is -80.29 kJ/mol. This is the amount of energy it takes to form 1 mol of NH3 (aq).
To determine the enthalpy required to form 3 mol of NH3 (aq), multiply -80.29 by 3:
[tex]-80.29*3\\= -240.97[/tex]
Answerb) -240.97 kJ
A new element with three naturally occurring isotopes has an average atomic mass determined to be 81.5529
amu. The first two isotopes have relative abundances of 76.12% and 10.27% and masses of 81.6643 amu and
81.1239 amu respectively. What is the mass of the third isotope?
- report your answer in six significant figures
- do not include units
Answers
The average atomic mass for the new element is given 81.5529 amu. The percentage abundance for the third isotope is 13.6 %. Then its atomic mass is 83.9 amu.
What are isotopes?Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.
The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:
atomic mass = ∑ (isotopic mass × %abundance /100 )
Apply the isotopic mass and abundance of all isotopes given as follows:
atomic mass of the element = (76.12/100 ×81.6643 amu) + (10.27/100 × 81.1239 amu) + (13.6 /100 × X amu) =81.5529 amu.
Then,
(13.6 /100 × X amu) = 70.41 amu.
X = 83.9 amu.
Therefore, the atomic mass of the third isotope is 83.9 amu.
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The reaction of H₂ with F2 produces HF with AH = -269 kJ/mol of HF. If the H-H and H-F bond energies are 432 and 565 kJ/mol,
respectively, what is the F-F bond energy?
H₂(g) +F₂ (g)—>2HF (g)
Answers
The F-F bond energy is 293 kJ/mol.
What is bond energy?Bond Energy also known as simply bond enthalpy, is described as a quantity that offers insight into the strength of a chemical bond.
ΔH = ∑(bond energies of bonds broken) - ∑(bond energies of bonds formed)
In this reaction above one H-H bond and one F-F bond are broken, and two H-F bonds are formed. Thus, the enthalpy change can be shown as:
ΔH = (1 × H-H bond energy) + (1 × F-F bond energy) - (2 × H-F bond energy)
Which gives us :
-269 kJ/mol = (1 × 432 kJ/mol) + (1 × F-F bond energy) - (2 × 565 kJ/mol)
Therefore, the F-F bond energy = [1 × (432 kJ/mol) + 2 × (565 kJ/mol)] - 269 kJ/mol = 293 kJ/mol
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With carbon dioxide, what phase change takes place when the temperature
decreases from -40°C to -80°C at 2 atm?
Carbon Dioxide Phase Diagram
K
Pressure (atm)
20-
15-
10-
10
5-
0
Melting
point
-100
Solid
-80
OA. A liquid changes to a solid.
B. A gas changes to a solid.
OC. A solid changes to a liquid.
OD. A gas changes to a liquid.
Boiling
point
Liquid
ㅎ
Gas
-20
.0
Temperature (°C)
20
Answers
With carbon dioxide, the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
How does this occur?When the temperature decreases from -40°C to -80°C at 2 atm, the pressure and temperature of the carbon dioxide falls within the region in the phase diagram where the substance changes from a gas to a solid. This process is called deposition or sublimation.
Therefore, the correct answer is as given above. It could then be concluded that the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
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Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of Sn?
a. 118 protons, 50 neutrons, 118 electrons
b. 118 protons, 118 neutrons, 50 electrons
c. 50 protons, 68 neutrons, 50 electrons
d. 68 protons, 68 neutrons, 50 electrons
e. 50 protons, 50 neutrons, 50 electrons
Answers
The correct number of protons, neutrons, and electrons in a neutral atom of Sn is 50 protons, 68 neutrons, 50 electrons.
Neutral atom of Sn
Atomic number of Sn is 50 .
As we know
Atomic number = no. of protons = no. of electrons
then ,
Number of protons = 50
Number of electrons = 50
Now , atomic mass = no. of protons + no. of neutrons
Atomic mass of Sn is 118 u
Therefore , 118 = 50 + number of neutrons
Number of neutrons = 118 -50
Number of neutrons = 68
Hence, in a neutral atom of Sn , there are 50 protons , 68 neutrons , 50 electrons. option (c) is correct .
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In the chemical reaction:
CH4 + H₂O → CO + 3H₂
How many moles of methane (CH4) required to produce 9.03 g of hydrogen?
Answers
According to the stoichiometry of the given balanced chemical equation, 1.85 moles of methane are required to produce 9.03 g of hydrogen.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given reaction, 16 g that is 1 mole methane gives 6 g that is 3 moles hydrogen ,hence for 9 g hydrogen 16×6/9=24.08 g methane is needed and it is equivalent to number of moles= 24.08/16=1.85 moles.
Thus,1.85 moles of methane are required to produce 9.03 g of hydrogen.
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Which coefficients correctly balance the equation below
AI+CuSO - -> AI2(SO4)3+Cu
Answers
Answer:
Explanation:
In order to balance the equation, the coefficients in front of each element must be equal on both sides of the equation. Here's one way to balance the equation:
2 AI + 3 CuSO4 ---------------> 2 AI2(SO4)3 + 3 Cu
This means that for every 2 atoms of AI and 3 molecules of CuSO4, you'll get 2 molecules of AI2(SO4)3 and 3 atoms of Cu.
What will happen to the portion of the molecule labeled C at the end of
the reaction when the product is released?
A. It will break down during the reaction process.
B. It will be scavenged by lysosomes and destroyed.
C. It will bind to another molecule of substrate.
D. It will be divided between the two products.
Answers
It will be scavenged by lysosomes and destroyed.
What is a lysosome?
Degradative organelles known as lysosomes serve as the cell's waste disposal system by breaking down old components found in the cytoplasm from both inside and outside the cell. Endocytosis is the process by which material from the outside of the cell is taken up; autophagy is the process by which material from within the cell is broken down.The organelles come in a wide range of sizes; the bigger ones might be up to ten times bigger than the smaller ones.Belgian researcher Christian de Duve, who later won the Nobel Prize in Physiology or Medicine in 1974, was responsible for their discovery and naming.More than 50 membrane proteins and more than 60 distinct enzymes have been found in lysosomes.To know more about lysosomes, click the link given below:
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If dinitrogen pentoxide decomposes as follows: 2 N₂O5(g) → 4NO2(g) + O2(g) If the reaction rate is expressed as: rate = k [N₂0513, then the overall reaction order is: (Enter your answer as a number. (i.e. as "5" not "five"))
Answers
The order of reaction can be known from the rate equation.
What is the overall order of reaction?
The question is incomplete but I will try to explain the concept of order of reaction to you.
We have to note that when we talk about the order of the reaction what we mean is the order that we can be able to obtain from the stoichiometry of the reaction.
We do not only look at the reaction equation as we try to obtain the order of reaction but we rely so heavily on the empirical data that we can get from the reaction for the order of reaction in each specie.
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1. There are 3 main types of chemical formulas: empirical, molecular and structural.
Structural formulas identify the location of chemical bonds between the atoms of a
molecule. Consider the following molecular structure below:
(a) Redraw the structure in the form of expanded and condensed structures.
(b) Classify the carbons labelled a and b as primary, secondary or tertiary.
[4 marks]
Answers
(a) Expanded structure:
CH3–CH2–CH–CH3
Condensed structure:
CH3CH2CHCH3
(b) Carbon a is a primary carbon and Carbon b is a secondary carbon.
What are chemical formulas?Generally, Chemical formulas are symbols used to represent elements and molecules.
They usually consist of the symbols for the elements in the molecule, with subscripts indicating the number of each atom.
For example, the chemical formula for water is H2O, indicating two hydrogen atoms and one oxygen atom.
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8. Making soap is what type of reaction is it
Chemical
Physical
Phase change
all of the above
Answers
Answer:
chemical reaction
Explanation:
Answer:
Making soap can be considered a chemical reaction.
Explanation:
In the process of making soap, a reaction takes place between a fat or oil and an alkali, such as lye (sodium hydroxide), which results in the formation of soap molecules and glycerol. This reaction is known as saponification. The change in the composition of the reactants to form a new substance is a chemical change, not a physical change or a phase change.
Mrs Blocks students are studying chemical reactions.a classic reaction occurs when a metal is added to hydrochloric acid Miguel and Kai added 30g of hydrochloric acid to 30g of magnesium in a large test tube bubbles
Answers
The boys could cover the end of the test tube with a balloon to capture the escaping gas. Therefore, the correct option is option C.
What is chemical reactions?A chemical reaction is the chemical change from one set of chemical components into another. Chemical reactions are changes that solely affect the locations of electrons inside the formation as well as breakdown of chemical bonds that link atoms, and without any modification to the nuclei, and therefore are frequently represented using a chemical equation.
Nuclear chemistry is the branch of chemistry that studies the chemical interactions of unstable especially radioactive materials, which can result in both electronic plus nuclear alterations. The boys could cover the end of the test tube with a balloon to capture the escaping gas.
Therefore, the correct option is option C.
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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of water can be made when 41 moles of HNO3 are consumed?
Answers
Answer:
5.125 moles of water
Explanation:
Given the reaction:
Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
When 41 moles of HNO3 are consumed, we can calculate the number of moles of water produced using the stoichiometric coefficients in the balanced chemical equation.
According to the coefficients, 1 mole of Cu reacts with 8 moles of HNO3 to produce 4 moles of H2O. Therefore, when 41 moles of HNO3 are consumed, we can calculate the number of moles of water produced as follows:
41 moles HNO3 / 8 moles HNO3 per mole H2O = 5.125 moles H2O
So, 5.125 moles of water can be made when 41 moles of HNO3 are consumed.
Balance this equation
C₂H₁6 + 02 -> CO ₂ (g) + H₂O(g)
Answers
The balanced form of the chemical equation given above is as follows: C₂H₁₆ + 60₂ -> 6CO₂ (g) + 6H₂O(g).
What is a balanced chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.
According to this question, the equation for photosynthesis is given. The balanced form is as follows:
C₂H₁₆ + 60₂ -> 6CO₂ (g) + 6H₂O(g)
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What are the properties of noble gases and why are they so unreactive?
Answers
Answer:
because they have a full outer electron shell
Explanation:
Answer:
Noble gases are unreactive because they have a full outer electron shell, making them very stable and unlikely to participate in chemical reactions. They have low reactivity and are odorless, tasteless, and colorless gases.
Explanation:
To aid in the prevention of tooth decay, it is recommended that drinking water contain 1.00 ppm
fluoride, F−.
How many grams of F−
must be added to a cylindrical water reservoir having a diameter of 3.53×10^2 m
and a depth of 12.65 m?
mass:
g F−
How many grams of sodium fluoride, NaF, contain this amount of fluoride?
mass:
Answers
1 ppm of F- means 1 mg of F- in 1 L of water. The cylindrical water has a volume of 12.3 × 10⁸ L. Then, 12.38 × 10⁵ g of F- have to be added to the reservoir.
What is ppm concentration?PPM or parts per million is a term used to express the concentration of a substance. One ppm of a substance is its 1 mg in 1 L. Hence, 1 mg of F- is present in 1 L of water.
Volume of cylinder = π r² d
given that, diameter = 353 m
radius = 176.5 m
d= 12.65 m
v = 3.14 × (176.5)²×12.65 = 12.37× 10⁵ m³ = 12.37 × 10⁸ L.
1 L have 1 mg F-. Then, 12.37 × 10⁸ mg or 12.37 × 10⁵ g of F-.
Molar mass of NaF = 46 g/mol
46 g of NaF contains 19 g of F-. Then, mass of NaF that contains 12.37 × 10⁵ g of F- is:
12.37 × 10⁵ g × 46/19 = 2.97×10⁷ g.
Therefore, 2.97×10⁷ g of NaF contains 12.37 × 10⁵ g of F-.
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2 NaClO3 → 2 NaCl + 3 O2
Calculate the mass of O2 produced as the result of the decomposition of 843 g of NaClO3.
Answers
Taking into account the reaction stoichiometry, 380.12 grams of O₂ are produced as the result of the decomposition of 843 g of NaClO₃.
Reaction stoichiometryIn first place, the balanced reaction iS:
2 NaClO₃ → 2 NaCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
NaClO₃: 2 molesNaCl: 2 molesO₂: 3 molesThe molar mass of the compounds is:
NaClO₃: 106.45 g/moleNaCl: 58.45 g/moleO₂: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
NaClO₃: 2 moles ×106.45 g/mole= 212.9 gramsNaCl: 2 moles ×58.45 g/mole= 116.9 gramsO₂: 3 moles ×32 g/mole= 96 gramsMass of O₂ formedThe following rule of three can be applied: if by reaction stoichiometry 212.9 grams of NaClO₃ form 96 grams of O₂, 843 grams of NaClO₃ form how much mass of O₂?
mass of O₂= (843 grams of NaClO₃× 96 grams of O₂) ÷212.9 grams of NaClO₃
mass of O₂= 380.12 grams
Finally, 380.12 grams of O₂ are formed.
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An aqueous solution contains 5.0 % NaCl by mass.
Part A
Calculate the molality of the solution.
Part B
Calculate the mole fraction of the solution.
Answers
Molality of an aqueous solution of 5.0% NaCl will be 0.842 m. Mole fraction of NaCl is 0.014 and mole fraction of water is 0.98.
How do you calculate the molality of 5.0% NaCl solution?To calculate molality, we first calculate the mass of NaCl in the solution which is, 100 x 5/100% = 5g.
We then calculate the moles of NaCl in the solution,
5/58.45 = 0.08 (Molar mass of NaCl = 58.45)
Mass of water in the solution = 100g - 5g = 95g x 1/1000 = 0.095
Therefore, molality can now be calculated as,
Molality = 0.08/0.095 = 0.842 m.
How do you calculate the mole fraction of the solution?To calculate the mole fraction of the solution, we first calculate the moles of water in the solution,
Moles of water = 95/18 = 5.27 mol of water (Since molar mass of water = 18)
Now, mole fraction of NaCl = 0.08/5.27 + 0.08 = 0.014
Mole fraction of water = 5.27/5.27 + 0.08 = 0.098
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