Chemistry & Chemical Reactivity

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



Chemistry & Chemical Reactivity

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

About 5 billion kilograms of benzene, C6H6, are made each year. Benzene is used as a starting material for many other compounds and as a solvent (although it is also a carcinogen, and its use is restricted). One compound that can be made from benzene is cyclohexane, C6H12.

C6H6() + 3 H2(g) → C6H12(ℓ)

ΔrH° = −206.7 kJ/mol-rxn;

ΔrS° = −361.5 J/K · mol-rxn

Is this reaction predicted to be product-favored at equilibrium at 25 °C? Is the reaction enthalpy- or entropy-driven?

Interpretation Introduction


The ΔrG° value for the reaction should be calculated and it should be predicted that the reaction is whether product favoured at equilibrium.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔG. It is related to entropy and entropy by the following expression,


Here, ΔH is the change in enthalpy and ΔS is the change in entropy.


The value of ΔrG° for the reaction C6H6(l) + 3H2(g)C6H12(l) is calculated below.


The value of ΔH is 206.7 kJ/mol-rxn.

The value of ΔS is 361.5 J/Kmol-rxn.

The given reaction is,

  C6H6(l) + 3H2(g)C6H

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