   Chapter 18, Problem 89SCQ

Chapter
Section
Textbook Problem

In Chapter 13, you learned that entropy, as well as enthalpy, plays a role in the solution process. If ΔH° for the solution process is zero, explain how the process can be driven by entropy.

Interpretation Introduction

Interpretation:

It should be explained that how the process can be driven by entropy when the value of enthalpy change is zero.

Concept introduction:

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

ΔGo= ΔHo-TΔSo

The magnitude and sign of ΔGo decides if the process is product-favored and spontaneous. It should be negative for a product-favored reaction.

Explanation

The magnitude and sign of ΔGo decides if the process is product-favored and spontaneous. It is related to entropy and entropy by the following expression,

ΔGo= ΔHo-TΔSo

If the value of ΔHo is zero, then the expression is,

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