   Chapter 5.7, Problem 5.10CYU

Chapter
Section
Textbook Problem

Calculate the standard enthalpy of combustion for benzene, C6H6.C6H6(ℓ) + 15/2 O2(g) → 6 CO2(g) + 3 H2O(ℓ) ΔrH° = ?The enthalpy of formation of benzene is known [ΔrH°[C6H6(ℓ)] = +49.0 kJ/mol], and other values needed can be found in Appendix L.

Interpretation Introduction

Interpretation:

The enthalpy change for the combustion of benzene has to be determined.

Concept Introduction:

Hess’s law:

If a reaction proceeds in two or more other reaction,ΔrH0 for the overall process is the sum of ΔrH0 values of all those reactions

Explanation

ΔrH0=-393.5kJ/mol(6molCO21mol-rxn)ΔfH0(CO2)+(3molH2O1mol-rxn)ΔfH0(H2O)-(1molC6H61mol-rxn)ΔfH0(C6H6)+(15/2molO21mol-rxn)ΔfH0(O2)ΔfH0=(6molCO21mol-rxn)(-393.5kJ/mol)+(5molH2O1mol-rxn)(-285

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