Chapter 5.7, Problem 5.10CYU

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
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

Î”rH0=-393.5kJ/mol(6molâ€‰CO21molâ€‰-rxn)Î”fH0(CO2)â€‰+(3molâ€‰H2O1molâ€‰-rxn)Î”fH0(H2O)â€‰-(1molâ€‰C6H61molâ€‰-rxn)Î”fH0(C6H6)+(15/2molâ€‰O21molâ€‰-rxn)Î”fH0(O2)Î”fH0=(6molâ€‰CO21molâ€‰-rxn)(-393.5kJ/mol)â€‰+(5molâ€‰H2O1molâ€‰-rxn)(-285

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