General Chemistry
General Chemistry
7th Edition
ISBN: 9780073402758
Author: Chang, Raymond/ Goldsby
Publisher: McGraw-Hill College
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Chapter 9, Problem 9.70QP

(a)

Interpretation Introduction

Interpretation:

Enthalpy of the reaction using average bond enthalpies of reactants and products has to be calculated.

Concept Introduction:

ΔH° refers to change in enthalpy.  Change in enthalpy in a reaction and bond energy (BE) are related as,

ΔH° = ΣBE(reactants)-ΣBE(products)

(a)

Expert Solution
Check Mark

Answer to Problem 9.70QP

Enthalpy of the reaction using bond enthalpies of reactants and products is 2759 kJ/mol.

Explanation of Solution

Calculation of ΔH°

The given reaction is,

2 C2H6(g)+ 7 O2(g)  4 CO2(g) + 6 H2O(g)

Reactants O2 has one O=O bond, and two moles of ethane has two CC and twelve CH bonds.

Products are four moles of CO2 and it has totally eight C=O bonds and six moles of water has twelve OH bonds.

ΔH° for the reaction is calculated using average bond enthalpy values given in text book.

ΔH° = ΣBE(reactants)-ΣBE(products)ΔH° = [2BE(CC)+7BE(O=O)+12BE(CH)]-[8BE(C=O)+12BE(OH)]ΔH° =[(2×347 kJ/mol)+(7×498.7 kJ/mol)+(12×414 kJ/mol)][(8×799 kJ/mol)+(12×460 kJ/mol)] =[4968 kJ/mol+ 694 kJ/mol + 3491 kJ/mol][6392 kJ/mol + 5520 kJ/mol] = 2759 kJ/mol

(b)

Interpretation Introduction

Interpretation:

Enthalpy of the reaction using heat of formation of reactants and products has to be calculated.

Concept Introduction:

ΔH refers to change in enthalpy.  Change in enthalpy in a reaction and enthalpy of formation are related by the formula,

ΔHrxn°=ΣΔHf°(product)ΣΔHf°(reactant)

Where,

ΔHrxn° = enthalpy change in reactionΔHf°(product) = enthalpy or heat of formation of productΔHf°(reactant) = enthalpy or heat of formation of reactant

(b)

Expert Solution
Check Mark

Answer to Problem 9.70QP

Enthalpy of the reaction using enthalpy of formation of reactants and products is calculated as 2855 kJ/mol.

Explanation of Solution

The given reaction is,

2 C2H6(g)+ 7 O2(g)  4 CO2(g) + 6 H2O(g)

Known data from appendix 2:

ΔHf° for CO2(g) =   -393.5 kJ/molΔHf° for H2O(g) =   -241.8 kJ/molΔHf° for C2H6(g) =   -84.7 kJ/molΔHf° for O2(g) =     0 kJ/mol

ΔH° for the reaction is calculated using enthalpy of formation of products and reactants given in text book (chapter 6)

ΔH° =[4ΔHf°(CO2(g))+6ΔHf°(H2O(g))]-[2ΔHf°(C2H6(g))+7ΔHf°(O2(g))] =[(4×-393.5 kJ/mol)+(6×241.8 kJ/mol)]-[(2×-84.7 kJ/mol)+(7×0 kJ/mol)] = - 2855 kJ/mol

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Chapter 9 Solutions

General Chemistry

Ch. 9.6 - Prob. 1RCCh. 9.7 - Prob. 1PECh. 9.7 - Prob. 2PECh. 9.7 - Prob. 1RCCh. 9.8 - Prob. 1PECh. 9.8 - Prob. 1RCCh. 9.9 - Practice Exercise Draw the Lewis structure for...Ch. 9.9 - Prob. 2PECh. 9.9 - Prob. 3PECh. 9.9 - Prob. 4PECh. 9.9 - Prob. 1RCCh. 9.10 - Prob. 1PECh. 9.10 - Prob. 1RCCh. 9 - Prob. 9.1QPCh. 9 - 9.2 Use the second member of each group from Group...Ch. 9 - Prob. 9.3QPCh. 9 - Prob. 9.4QPCh. 9 - Prob. 9.5QPCh. 9 - Prob. 9.6QPCh. 9 - Prob. 9.7QPCh. 9 - Prob. 9.8QPCh. 9 - Prob. 9.9QPCh. 9 - Prob. 9.10QPCh. 9 - Prob. 9.11QPCh. 9 - Prob. 9.13QPCh. 9 - Prob. 9.14QPCh. 9 - Prob. 9.15QPCh. 9 - Prob. 9.16QPCh. 9 - Prob. 9.17QPCh. 9 - Prob. 9.18QPCh. 9 - Prob. 9.19QPCh. 9 - Prob. 9.20QPCh. 9 - Prob. 9.21QPCh. 9 - 9.22 Explain how the lattice energy of an ionic...Ch. 9 - Prob. 9.23QPCh. 9 - Prob. 9.24QPCh. 9 - Prob. 9.25QPCh. 9 - Prob. 9.26QPCh. 9 - Prob. 9.27QPCh. 9 - Prob. 9.28QPCh. 9 - Prob. 9.29QPCh. 9 - Prob. 9.30QPCh. 9 - Prob. 9.31QPCh. 9 - Prob. 9.33QPCh. 9 - 9.34 Arrange these bonds in order of increasing...Ch. 9 - Prob. 9.35QPCh. 9 - Prob. 9.36QPCh. 9 - Prob. 9.37QPCh. 9 - Prob. 9.38QPCh. 9 - Prob. 9.39QPCh. 9 - Prob. 9.40QPCh. 9 - Prob. 9.41QPCh. 9 - Prob. 9.42QPCh. 9 - Prob. 9.43QPCh. 9 - Prob. 9.44QPCh. 9 - Prob. 9.45QPCh. 9 - Prob. 9.46QPCh. 9 - Prob. 9.47QPCh. 9 - Prob. 9.48QPCh. 9 - Prob. 9.49QPCh. 9 - Prob. 9.50QPCh. 9 - Prob. 9.51QPCh. 9 - Prob. 9.52QPCh. 9 - Prob. 9.53QPCh. 9 - Prob. 9.54QPCh. 9 - Prob. 9.55QPCh. 9 - Prob. 9.56QPCh. 9 - Prob. 9.57QPCh. 9 - Prob. 9.58QPCh. 9 - Prob. 9.59QPCh. 9 - Prob. 9.60QPCh. 9 - Prob. 9.61QPCh. 9 - Prob. 9.62QPCh. 9 - Prob. 9.63QPCh. 9 - Prob. 9.64QPCh. 9 - Prob. 9.65QPCh. 9 - Prob. 9.66QPCh. 9 - Prob. 9.67QPCh. 9 - Prob. 9.68QPCh. 9 - Prob. 9.69QPCh. 9 - Prob. 9.70QPCh. 9 - Prob. 9.71QPCh. 9 - Prob. 9.72QPCh. 9 - Prob. 9.73QPCh. 9 - Prob. 9.74QPCh. 9 - Prob. 9.75QPCh. 9 - Prob. 9.76QPCh. 9 - Prob. 9.77QPCh. 9 - Prob. 9.78QPCh. 9 - Prob. 9.79QPCh. 9 - Prob. 9.80QPCh. 9 - 9.81 Draw reasonable resonance structures for...Ch. 9 - Prob. 9.82QPCh. 9 - Prob. 9.83QPCh. 9 - Prob. 9.84QPCh. 9 - Prob. 9.85QPCh. 9 - Prob. 9.86QPCh. 9 - Prob. 9.87QPCh. 9 - Prob. 9.88QPCh. 9 - Prob. 9.89QPCh. 9 - Prob. 9.90QPCh. 9 - Prob. 9.91QPCh. 9 - Prob. 9.92QPCh. 9 - Prob. 9.93QPCh. 9 - Prob. 9.94QPCh. 9 - Prob. 9.95QPCh. 9 - Prob. 9.96QPCh. 9 - Prob. 9.97QPCh. 9 - Prob. 9.98QPCh. 9 - Prob. 9.99QPCh. 9 - Prob. 9.100QPCh. 9 - Prob. 9.101QPCh. 9 - Prob. 9.102QPCh. 9 - Prob. 9.103QPCh. 9 - Prob. 9.104QPCh. 9 - Prob. 9.105QPCh. 9 - Prob. 9.106QPCh. 9 - Prob. 9.107QPCh. 9 - Prob. 9.108QPCh. 9 - 9.109 Among the common inhaled anesthetics...Ch. 9 - 9.110 Industrially, ammonia is synthesized by the...Ch. 9 - Prob. 9.111QPCh. 9 - Prob. 9.112QPCh. 9 - Prob. 9.113SPCh. 9 - Prob. 9.114SPCh. 9 - Prob. 9.115SPCh. 9 - Prob. 9.116SPCh. 9 - Prob. 9.117SPCh. 9 - Prob. 9.118SP
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