Chemistry
Chemistry
4th Edition
ISBN: 9780393919370
Author: Thomas R. Gilbert
Publisher: NORTON
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Chapter 13, Problem 13.109QP
Interpretation Introduction

Interpretation: The fuel values of formaldehyde and formic acid is to be calculated and the compound having higher fuel value is to be predicted.

Concept Introduction: The calorie content of substance is calculated by determining the energy released in the combustion of the one gram mass of substance.

To determine: The fuel values of formaldehyde and formic acid and the compound having higher fuel value out of it.

Expert Solution & Answer
Check Mark

Answer to Problem 13.109QP

The fuel value of formaldehyde is 19.00kJ/g and the fuel value of formic acid is 13.064kJ/g. The fuel value of formaldehyde is more than formic acid.

Explanation of Solution

Given

The enthalpy of formation of formaldehyde is 108.6kJ/mol.

The enthalpy of formation of formic acid is 378.7kJ/mol.

The balanced chemical equation for the combustion of formaldehyde is,

CH2O+O2(g)CO2(g)+H2O(l)

The enthalpy change of the combustion reaction of formaldehyde is calculated by the formula,

ΔH=nΔH(products)mΔH(reactants)=(ΔHCO2(g)+ΔHH2O(l))(ΔHCH2O+ΔHO2(g))

Substitute the values of ΔHCO2(g), ΔHH2O(l), ΔHCH2O and ΔHO2(g) from appendix C in equation.

ΔH=(1×393.5kJ/mol+1×285.83kJ/mol)(1×108.6kJ/mol+1×0.0kJ/mol)=570.73kJ/mol

The chemical equation for the combustion of formic acid is,

2CH2O2+O2(g)2CO2(g)+2H2O(l)

The enthalpy change of the combustion reaction of palmitic acid is calculated by the formula,

ΔH=nΔH(products)mΔH(reactants)=(2ΔHCO2(g)+2ΔHH2O(l))(2ΔHCH2O2+ΔHO2(g))

Substitute the values of ΔHCO2(g), ΔHH2O(l), ΔHCH2O2 and ΔHO2(g) from appendix C in equation.

ΔH=(2×393.5kJ/mol+2×285.83kJ/mol)(2×378.7kJ/mol+1×0.0kJ/mol)=601.26kJ/mol

The heat produced per gram in the combustion of formaldehyde is calculated by dividing its enthalpy change of combustion by the molar mass.

Fuelvalue=570.73kJ/mol30.031g/mol=19.00kJ/g

The heat produced per gram in the combustion of formic acid is calculated by dividing its enthalpy change of combustion by the molar mass.

Fuelvalue=601.26kJ/mol46.025g/mol=13.064kJ/g

Conclusion

The fuel value of formaldehyde is 19.00kJ/g and the fuel value of formic acid is 13.064kJ/g. The fuel value of formaldehyde is more than formic acid.

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Chapter 13 Solutions

Chemistry

Ch. 13.7 - Prob. 11PECh. 13.8 - Prob. 12PECh. 13.8 - Prob. 13PECh. 13 - Prob. 13.1VPCh. 13 - Prob. 13.2VPCh. 13 - Prob. 13.3VPCh. 13 - Prob. 13.4VPCh. 13 - Prob. 13.5VPCh. 13 - Prob. 13.6VPCh. 13 - Prob. 13.7VPCh. 13 - Prob. 13.8VPCh. 13 - Prob. 13.9VPCh. 13 - Prob. 13.10VPCh. 13 - Prob. 13.11VPCh. 13 - Prob. 13.12VPCh. 13 - Prob. 13.13VPCh. 13 - Prob. 13.14VPCh. 13 - Prob. 13.15VPCh. 13 - Prob. 13.16VPCh. 13 - Prob. 13.17QPCh. 13 - Prob. 13.18QPCh. 13 - Prob. 13.19QPCh. 13 - Prob. 13.20QPCh. 13 - Prob. 13.21QPCh. 13 - Prob. 13.22QPCh. 13 - Prob. 13.23QPCh. 13 - Prob. 13.24QPCh. 13 - Prob. 13.25QPCh. 13 - Prob. 13.26QPCh. 13 - Prob. 13.27QPCh. 13 - Prob. 13.28QPCh. 13 - Prob. 13.29QPCh. 13 - Prob. 13.30QPCh. 13 - Prob. 13.31QPCh. 13 - Prob. 13.32QPCh. 13 - Prob. 13.33QPCh. 13 - Prob. 13.34QPCh. 13 - Prob. 13.35QPCh. 13 - Prob. 13.36QPCh. 13 - Prob. 13.37QPCh. 13 - Prob. 13.38QPCh. 13 - Prob. 13.39QPCh. 13 - Prob. 13.40QPCh. 13 - Prob. 13.41QPCh. 13 - Prob. 13.42QPCh. 13 - Prob. 13.43QPCh. 13 - Prob. 13.44QPCh. 13 - Prob. 13.45QPCh. 13 - Prob. 13.46QPCh. 13 - Prob. 13.47QPCh. 13 - Prob. 13.48QPCh. 13 - Prob. 13.49QPCh. 13 - Prob. 13.50QPCh. 13 - Prob. 13.51QPCh. 13 - Prob. 13.52QPCh. 13 - Prob. 13.53QPCh. 13 - Prob. 13.54QPCh. 13 - Prob. 13.55QPCh. 13 - Prob. 13.56QPCh. 13 - Prob. 13.57QPCh. 13 - Prob. 13.58QPCh. 13 - Prob. 13.59QPCh. 13 - Prob. 13.60QPCh. 13 - Prob. 13.61QPCh. 13 - Prob. 13.62QPCh. 13 - Prob. 13.63QPCh. 13 - Prob. 13.64QPCh. 13 - Prob. 13.65QPCh. 13 - Prob. 13.66QPCh. 13 - Prob. 13.67QPCh. 13 - Prob. 13.68QPCh. 13 - Prob. 13.69QPCh. 13 - Prob. 13.70QPCh. 13 - Prob. 13.71QPCh. 13 - Prob. 13.72QPCh. 13 - Prob. 13.73QPCh. 13 - Prob. 13.74QPCh. 13 - Prob. 13.75QPCh. 13 - Prob. 13.76QPCh. 13 - Prob. 13.77QPCh. 13 - Prob. 13.78QPCh. 13 - Prob. 13.79QPCh. 13 - Prob. 13.80QPCh. 13 - Prob. 13.81QPCh. 13 - Prob. 13.82QPCh. 13 - Prob. 13.83QPCh. 13 - Prob. 13.84QPCh. 13 - Prob. 13.85QPCh. 13 - Prob. 13.86QPCh. 13 - Prob. 13.87QPCh. 13 - Prob. 13.88QPCh. 13 - Prob. 13.89QPCh. 13 - Prob. 13.90QPCh. 13 - Prob. 13.91QPCh. 13 - Prob. 13.92QPCh. 13 - Prob. 13.93QPCh. 13 - Prob. 13.94QPCh. 13 - Prob. 13.95QPCh. 13 - Prob. 13.96QPCh. 13 - Prob. 13.97QPCh. 13 - Prob. 13.98QPCh. 13 - Prob. 13.99QPCh. 13 - Prob. 13.100QPCh. 13 - Prob. 13.101QPCh. 13 - Prob. 13.102QPCh. 13 - Prob. 13.103QPCh. 13 - Prob. 13.104QPCh. 13 - Prob. 13.105QPCh. 13 - Prob. 13.106QPCh. 13 - Prob. 13.107QPCh. 13 - Prob. 13.108QPCh. 13 - Prob. 13.109QPCh. 13 - Prob. 13.110QPCh. 13 - Prob. 13.111QPCh. 13 - Prob. 13.112QPCh. 13 - Prob. 13.113QPCh. 13 - Prob. 13.114QPCh. 13 - Prob. 13.115QPCh. 13 - Prob. 13.116QPCh. 13 - Prob. 13.117QPCh. 13 - Prob. 13.118QPCh. 13 - Prob. 13.119QPCh. 13 - Prob. 13.120QPCh. 13 - Prob. 13.121QPCh. 13 - Prob. 13.122QPCh. 13 - Prob. 13.123QPCh. 13 - Prob. 13.124QPCh. 13 - Prob. 13.125QPCh. 13 - Prob. 13.126QPCh. 13 - Prob. 13.127QPCh. 13 - Prob. 13.128QPCh. 13 - Prob. 13.129QPCh. 13 - Prob. 13.130QPCh. 13 - Prob. 13.131QPCh. 13 - Prob. 13.132QPCh. 13 - Prob. 13.133QPCh. 13 - Prob. 13.134QPCh. 13 - Prob. 13.135APCh. 13 - Prob. 13.136APCh. 13 - Prob. 13.137APCh. 13 - Prob. 13.138APCh. 13 - Prob. 13.139APCh. 13 - Prob. 13.140APCh. 13 - Prob. 13.141APCh. 13 - Prob. 13.142APCh. 13 - Prob. 13.143APCh. 13 - Prob. 13.144APCh. 13 - Prob. 13.145APCh. 13 - Prob. 13.146APCh. 13 - Prob. 13.147APCh. 13 - Prob. 13.148APCh. 13 - Prob. 13.149APCh. 13 - Prob. 13.150APCh. 13 - Prob. 13.151AP
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