Chemistry
Chemistry
4th Edition
ISBN: 9780393919370
Author: Thomas R. Gilbert
Publisher: NORTON
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Chapter 8, Problem 8.128QP

(a)

Interpretation Introduction

Interpretation: The enthalpy changes of the given reactions are to be calculated by using average bond energies.

Concept introduction: The energy which is required in a molecule to break one mole of a covalent bond in its gaseous phase is known as bond energy of that bond. It is expressed in terms of enthalpy change denoted by (ΔH) .

To determine: The enthalpy change of the given reaction.

(a)

Expert Solution
Check Mark

Answer to Problem 8.128QP

Solution

The enthalpy change (ΔHrxn) of the given reaction is 76kJ/mol_ .

Explanation of Solution

Explanation

The given reaction is,

CO2(g)+H2(g)H2O(g)+CO(g)

The bond enthalpy is calculated by using the formula,

ΔHrxn=ΔHbondbreakingΔHbondforming

Average bond energy of a C=O bond is 743kJ/mol .

Average bond energy of a HH bond in a hydrogen molecule is 436kJ/mol .

Average bond energy of a OH bond in water is 463kJ/mol .

Average bond energy of a CO bond is 1072kJ/mol .

Substitute the values of average bond energies of C=O , HH , OH and CO bond in the above formula to calculate the change in enthalpy of the reaction.

ΔHrxn=(2×C=O+1×HH)(2×OH+1×CO)=(2×743kJ/mol+1×436kJ/mol)(2×463kJ/mol+1×1072kJ/mol)=(1486+436kJ/mol)(926+1072kJ/mol)=19221998kJ/mol

Simplify the above equation,

ΔHrxn=76kJ/mol_

Hence, the enthalpy change of the given reaction is 76kJ/mol_ .

(b)

Interpretation Introduction

To determine: The enthalpy change of the given reaction.

(b)

Expert Solution
Check Mark

Answer to Problem 8.128QP

Solution

The enthalpy change (ΔHrxn) of the given reaction is 80kJ/mol_ .

Explanation of Solution

Explanation

The given reaction is,

N2(g)+O2(g)2NO(g)

The bond enthalpy is calculated by using the formula,

ΔHrxn=ΔHbondbreakingΔHbondforming

Average bond energy of a NN bond in a nitrogen molecule is 941kJ/mol .

Average bond energy of a O=O bond is 495kJ/mol .

Average bond energy of a NO bond is 678kJ/mol .

Substitute the values of average bond energies of NN , O=O and NO bond in the above formula to calculate the change in enthalpy of the reaction.

ΔHrxn=(1×NN+1×O=O)(2×NO)=(1×941kJ/mol+1×495kJ/mol)(2×678kJ/mol)=(941+495kJ/mol)(1356kJ/mol)=14361356kJ/mol

Simplify the above equation,

ΔHrxn=80kJ/mol_

Hence, the enthalpy change of the given reaction is 80kJ/mol_ .

(c)

Interpretation Introduction

To determine: The enthalpy change of the given reaction.

(c)

Expert Solution
Check Mark

Answer to Problem 8.128QP

Solution

The enthalpy change (ΔHrxn) of the given reaction is 61kJ/mol_ .

Explanation of Solution

The given reaction is,

C(s)+CO2(g)2CO(g)

The bond enthalpy is calculated by using the formula,

ΔHrxn=ΔHbondbreakingΔHbondforming

The enthalpy of sublimation of graphite, C(s) is 719kJ/mol .

Average bond energy of a C=O bond is 743kJ/mol .

Average bond energy of a CO bond is 1072kJ/mol .

Substitute the values of average bond energies of CC , C=O and CO bond in the above formula to calculate the change in enthalpy of the reaction.

ΔHrxn=(1×CC+2×C=O)(2×CO)=(1×719kJ/mol+2×743kJ/mol)(2×1072kJ/mol)=(719+1486kJ/mol)(2144kJ/mol)=22052144kJ/mol

Simplify the above equation,

ΔHrxn=61kJ/mol_

Hence, the enthalpy change of the given reaction is 61kJ/mol_ .

Conclusion

  1. a. The enthalpy change (ΔHrxn) of the given reaction is 76kJ/mol_ .
  2. b. The enthalpy change (ΔHrxn) of the given reaction is 80kJ/mol_ .
  3. c. The enthalpy change (ΔHrxn) of the given reaction is 61kJ/mol_ .

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Chapter 8 Solutions

Chemistry

Ch. 8.7 - Prob. 11PECh. 8.8 - Prob. 12PECh. 8 - Prob. 8.1VPCh. 8 - Prob. 8.2VPCh. 8 - Prob. 8.3VPCh. 8 - Prob. 8.4VPCh. 8 - Prob. 8.5VPCh. 8 - Prob. 8.6VPCh. 8 - Prob. 8.7VPCh. 8 - Prob. 8.8VPCh. 8 - Prob. 8.9VPCh. 8 - Prob. 8.10VPCh. 8 - Prob. 8.11VPCh. 8 - Prob. 8.12VPCh. 8 - Prob. 8.13VPCh. 8 - Prob. 8.14VPCh. 8 - Prob. 8.15VPCh. 8 - Prob. 8.16VPCh. 8 - Prob. 8.17VPCh. 8 - Prob. 8.18VPCh. 8 - Prob. 8.19QPCh. 8 - Prob. 8.20QPCh. 8 - Prob. 8.21QPCh. 8 - Prob. 8.22QPCh. 8 - Prob. 8.23QPCh. 8 - Prob. 8.24QPCh. 8 - Prob. 8.25QPCh. 8 - Prob. 8.26QPCh. 8 - Prob. 8.27QPCh. 8 - Prob. 8.28QPCh. 8 - Prob. 8.29QPCh. 8 - Prob. 8.30QPCh. 8 - Prob. 8.31QPCh. 8 - Prob. 8.32QPCh. 8 - Prob. 8.33QPCh. 8 - Prob. 8.34QPCh. 8 - Prob. 8.35QPCh. 8 - Prob. 8.36QPCh. 8 - Prob. 8.37QPCh. 8 - Prob. 8.38QPCh. 8 - Prob. 8.39QPCh. 8 - Prob. 8.40QPCh. 8 - Prob. 8.41QPCh. 8 - Prob. 8.42QPCh. 8 - Prob. 8.43QPCh. 8 - Prob. 8.44QPCh. 8 - Prob. 8.45QPCh. 8 - Prob. 8.46QPCh. 8 - Prob. 8.47QPCh. 8 - Prob. 8.48QPCh. 8 - Prob. 8.49QPCh. 8 - Prob. 8.50QPCh. 8 - Prob. 8.51QPCh. 8 - Prob. 8.52QPCh. 8 - Prob. 8.53QPCh. 8 - Prob. 8.54QPCh. 8 - Prob. 8.55QPCh. 8 - Prob. 8.56QPCh. 8 - Prob. 8.57QPCh. 8 - Prob. 8.58QPCh. 8 - Prob. 8.59QPCh. 8 - Prob. 8.60QPCh. 8 - Prob. 8.61QPCh. 8 - Prob. 8.62QPCh. 8 - Prob. 8.63QPCh. 8 - Prob. 8.64QPCh. 8 - Prob. 8.65QPCh. 8 - Prob. 8.66QPCh. 8 - Prob. 8.67QPCh. 8 - Prob. 8.68QPCh. 8 - Prob. 8.69QPCh. 8 - Prob. 8.70QPCh. 8 - Prob. 8.71QPCh. 8 - Prob. 8.72QPCh. 8 - Prob. 8.73QPCh. 8 - Prob. 8.74QPCh. 8 - Prob. 8.75QPCh. 8 - Prob. 8.76QPCh. 8 - Prob. 8.77QPCh. 8 - Prob. 8.78QPCh. 8 - Prob. 8.79QPCh. 8 - Prob. 8.80QPCh. 8 - Prob. 8.81QPCh. 8 - Prob. 8.82QPCh. 8 - Prob. 8.83QPCh. 8 - Prob. 8.84QPCh. 8 - Prob. 8.85QPCh. 8 - Prob. 8.86QPCh. 8 - Prob. 8.87QPCh. 8 - Prob. 8.88QPCh. 8 - Prob. 8.89QPCh. 8 - Prob. 8.90QPCh. 8 - Prob. 8.91QPCh. 8 - Prob. 8.92QPCh. 8 - Prob. 8.93QPCh. 8 - Prob. 8.94QPCh. 8 - Prob. 8.95QPCh. 8 - Prob. 8.96QPCh. 8 - Prob. 8.97QPCh. 8 - Prob. 8.98QPCh. 8 - Prob. 8.99QPCh. 8 - Prob. 8.100QPCh. 8 - Prob. 8.101QPCh. 8 - Prob. 8.102QPCh. 8 - Prob. 8.103QPCh. 8 - Prob. 8.104QPCh. 8 - Prob. 8.105QPCh. 8 - Prob. 8.106QPCh. 8 - Prob. 8.107QPCh. 8 - Prob. 8.108QPCh. 8 - Prob. 8.109QPCh. 8 - Prob. 8.110QPCh. 8 - Prob. 8.111QPCh. 8 - Prob. 8.112QPCh. 8 - Prob. 8.113QPCh. 8 - Prob. 8.114QPCh. 8 - Prob. 8.115QPCh. 8 - Prob. 8.116QPCh. 8 - Prob. 8.117QPCh. 8 - Prob. 8.118QPCh. 8 - Prob. 8.119QPCh. 8 - Prob. 8.120QPCh. 8 - Prob. 8.121QPCh. 8 - Prob. 8.122QPCh. 8 - Prob. 8.123QPCh. 8 - Prob. 8.124QPCh. 8 - Prob. 8.125QPCh. 8 - Prob. 8.126QPCh. 8 - Prob. 8.127QPCh. 8 - Prob. 8.128QPCh. 8 - Prob. 8.129QPCh. 8 - Prob. 8.130QPCh. 8 - Prob. 8.131QPCh. 8 - Prob. 8.132QPCh. 8 - Prob. 8.133QPCh. 8 - Prob. 8.134QPCh. 8 - Prob. 8.135QPCh. 8 - Prob. 8.136QPCh. 8 - Prob. 8.137QPCh. 8 - Prob. 8.138QPCh. 8 - Prob. 8.139APCh. 8 - Prob. 8.140APCh. 8 - Prob. 8.141APCh. 8 - Prob. 8.142APCh. 8 - Prob. 8.143APCh. 8 - Prob. 8.144APCh. 8 - Prob. 8.145APCh. 8 - Prob. 8.146APCh. 8 - Prob. 8.147APCh. 8 - Prob. 8.148APCh. 8 - Prob. 8.149APCh. 8 - Prob. 8.150APCh. 8 - Prob. 8.151APCh. 8 - Prob. 8.152APCh. 8 - Prob. 8.153APCh. 8 - Prob. 8.154APCh. 8 - Prob. 8.155APCh. 8 - Prob. 8.156APCh. 8 - Prob. 8.157APCh. 8 - Prob. 8.158APCh. 8 - Prob. 8.159APCh. 8 - Prob. 8.160APCh. 8 - Prob. 8.161APCh. 8 - Prob. 8.162APCh. 8 - Prob. 8.163APCh. 8 - Prob. 8.164APCh. 8 - Prob. 8.165APCh. 8 - Prob. 8.166APCh. 8 - Prob. 8.167APCh. 8 - Prob. 8.168APCh. 8 - Prob. 8.169APCh. 8 - Prob. 8.170APCh. 8 - Prob. 8.171APCh. 8 - Prob. 8.172APCh. 8 - Prob. 8.173APCh. 8 - Prob. 8.174APCh. 8 - Prob. 8.175APCh. 8 - Prob. 8.176AP
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