Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN: 9780534420123
Author: Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher: Cengage Learning
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Chapter 5, Problem 5.82QE

(a)

Interpretation Introduction

Interpretation:

Enthalpy change for the given reaction should be calculated. The given reaction is,

  CaCO3(s)CaO(s) + CO2(g)

Concept introduction:

Enthalpy(H): It is the total amount of heat in a particular system.

The value of standard enthalpy change ΔHο of the given reaction is calculated by the formula,

  ΔHrxn=npΔHfο(products)nrΔHfο(reactants)

Where,

ΔHfο is the standard enthalpies of formation.

n is the number of moles.

(a)

Expert Solution
Check Mark

Answer to Problem 5.82QE

Enthalpy change is 178.32kJ.

Explanation of Solution

The balanced equation for the given reaction follows as,

  CaCO3(s)CaO(s) + CO2(g)

Standard enthalpy of formation values is given below,

  ΔHfoof CaCO3(s)=1206.92kJ/molΔHfoof CaO(s)=635.09kJ/molΔHfoof CO2(g)=393.51kJ/mol

Change in enthalpy can be calculated by the equation:

  ΔHrxn=npΔHfο(products)nrΔHfο(reactants)

Substitute the values as follows,

  ΔHrxno=[(1 mol×635.09kJ/mol)+(1 mol×393.51kJ/mol)] [(1 mol×1206.92kJ/mol)]=178.32kJ

(b)

Interpretation Introduction

Interpretation:

Enthalpy change for the given reaction should be calculated. The given reaction is,

  2 HI(g) + F2(g)2 HF(g) + I2(s)

Concept introduction:

Refer to (a).

(b)

Expert Solution
Check Mark

Answer to Problem 5.82QE

Enthalpy change is 595.16kJ.

Explanation of Solution

The balanced equation for the given reaction follows as,

  2 HI(g) + F2(g)2 HF(g) + I2(s)

Standard enthalpy of formation values is given below,

  ΔHfoof HI(g)=26.48kJ/molΔHfoof F2(g)=0kJ/molΔHfoof HF(g)=271.1kJ/molΔHfoof I2(s)=0kJ/mol

Change in enthalpy can be calculated by the equation:

  ΔHrxn=npΔHfο(products)nrΔHfο(reactants)

Substitute the values as follows,

  ΔHrxno=[(2 mol×271.1kJ/mol)+(1 mol×0kJ/mol)] [(2 mol×26.48kJ/mol)+(1 mol×0kJ/mol)]=595.16kJ

(c)

Interpretation Introduction

Interpretation:

Enthalpy change for the given reaction should be calculated. The given reaction is,

  SF6(g) + 3 H2O(l)6 HF(g) + SO3(g)

Concept introduction:

Refer to (a).

(c)

Expert Solution
Check Mark

Answer to Problem 5.82QE

Enthalpy change is 44.17kJ.

Explanation of Solution

The balanced equation for the given reaction follows as,

  SF6(g) + 3 H2O(l)6 HF(g) + SO3(g)

Standard enthalpy of formation values is given below,

  ΔHfoof SF6(g)=1209kJ/molΔHfoof H2O(l)=285.83kJ/molΔHfoof HF(g)=271.1kJ/molΔHfoof SO3(g)=395.72kJ/mol

Change in enthalpy can be calculated by the equation:

  ΔHrxn=npΔHfο(products)nrΔHfο(reactants)

Substitute the values as follows,

  ΔHrxno=[(6 mol×271.1kJ/mol)+(1 mol×395.72kJ/mol)] [(1 mol×1209kJ/mol)+(3 mol×285.83kJ/mol)]=44.17kJ

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Chapter 5 Solutions

Chemistry: Principles and Practice

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