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11 Dec 2019

1. The chemical equation for the synthesis, balanced only for the reactants, is as follows. Supply the coefficients for KCl and H2O required to balance the equation completely.

FeCl3Â·6H2O(aq) + 3K2C2O4Â·H2O(aq)

Â® K3Fe(C2O4)3Â·3H2O(s) + KCl(aq) + H2O(l)

Note that the reactants are used as their hydrates. FeCl3Â·6H2O means that one mol of the compound corresponds to one mol of FeCl3 and six mol of water. K2C2O4Â·H2O means that three mol of the compound corresponds to three mol K2C2O4 and three mol of water.

2. Calculate the amount (mols) corresponding to 5.00 g of FeCl3Â·6H2O (270.3 g/mol) and to 11.00 g of K2C2O4Â·H2O (184.2 g/mol). Note that the molar masses necessarily include the water of hydration.

3. On the basis of the chemical amounts calculated in no. 2 and the balanced chemical equation, determine the limiting reactant showing your calculations and telling why you chose that reactant.

4. Calculate the theoretical yield of the coordination compound (molar mass = 491.3 g/mol).

The product, like the reactants, is a hydrate. So the molar mass given is for the hydrate.

5. Calculate the percent yield based on an (assumed) actual yield of 7.52 g.

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Patrina SchowalterLv2

13 Dec 2019

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1- The molar heat capacity of silver is 25.35 J/molâ âC. How much energy would it take to raise the temperature of 8.20 g of silver by 14.5 âC?

Express your answer with the appropriate units.

_____________

Part A

Calculate the enthalpy of the reaction

2NO(g)+O2(g)â2NO2(g)

given the following reactions and enthalpies of formation:

12N2(g)+O2(g)âNO2(g), ÎHâA=33.2 kJ

12N2(g)+12O2(g)âNO(g), ÎHâB=90.2 kJ

Express your answer with the appropriate units.

2- A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 196 g of solution. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 âC. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.

Enter your answer in kilojoules per mole of compound to three significant figures.

_________

3- A volume of 110. mL of H2O is initially at room temperature (22.00 âC). A chilled steel rod at 2.00 âCis placed in the water. If the final temperature of the system is 21.00 âC , what is the mass of the steel bar?

Use the following values:

specific heat of water = 4.18 J/(gâ âC)

specific heat of steel = 0.452 J/(gâ âC)

Express your answer to three significant figures and include the appropriate units.

Part B

The specific heat of water is 4.18 J/(gâ âC). Calculate the molar heat capacity of water.

Express your answer to three significant figures and include the appropriate units.

______-

4- What is the enthalpy for the following reaction?

overall: N2O4â2NO2

Express your answer numerically in kilojoules per mole.

____________

Part B

Calculate the enthalpy of the reaction

4B(s)+3O2(g)â2B2O3(s)

given the following pertinent information:

B2O3(s)+3H2O(g)â3O2(g)+B2H6(g), ÎHâA=+2035 kJ

2B(s)+3H2(g)âB2H6(g), ÎHâB=+36 kJ

H2(g)+12O2(g)âH2O(l), ÎHâC=â285 kJ

H2O(l)âH2O(g), ÎHâD=+44 kJ

Express your answer with the appropriate units.

_____________

5- What is the balanced chemical equation for the reaction used to calculate ÎHâf of MgCO3(s)?

If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution.

Express your answer as a chemical equation.

__________

6- Part A

Determine the enthalpy for this reaction:

Ca(OH)2(s)+CO2(g)âCaCO3(s)+H2O(l)

Express your answer in kilojoules per mole to one decimal place.

_______

Part B

Consider the reaction

Ca(OH)2(s)âCaO(s)+H2O(l)

with enthalpy of reaction

ÎHrxnâ=65.2kJ/mol

What is the enthalpy of formation of CaO(s)?

Express your answer in kilojoules per mole to one decimal place.

________

7- Part A

Write a balanced chemical equation depicting the formation of one mole of H2O2(g) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

_____

Part B

For H2O2(g), find the value of ÎHâf. (Use Appendix C)

Express your answer using five significant figures.

_____

PART C: Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

_____

Part D

For CaCO3(s), find the value of ÎHâf. (Use Appendix C)

Express your answer using five significant figures.

_____

Part E

Write a balanced chemical equation depicting the formation of one mole of POCl3(l) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

____

Part F

For POCl3(l), find the value of ÎHâf. (Use Appendix C)

Express your answer using four significant figures.

_____

Part G

Write a balanced chemical equation depicting the formation of one mole of C2H5OH(l) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

_____

Part H

For C2H5OH(l), find the value of ÎHâf. (Use Appendix C)

Express your answer using four significant figures.

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