Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.
ISBN 10: 1133610668
ISBN 13: 978-1-13361-066-3

Chapter 15 - Chemical Thermodynamics - Exercises - Temperature Range of Spontaneity - Page 606: 117

Answer

When $\Delta G=0$, that is, when the system is in equilibrium.

Work Step by Step

Recall that $\Delta G= \Delta H-T\Delta S$ For $\Delta S=\frac{\Delta H}{T}$ to be true, $\Delta G$ must be 0. $\Delta G=0\implies $ system is in equilibrium. Therefore, $\Delta S=\frac{\Delta H}{T}$ is true when the system is in equilibrium.
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