Chapter 16, Problem 55E

Interpretation Introduction

Interpretation: The reaction of formation of ${\text{N}}_{\text{2}}{\text{O}}_{\text{4}}$, and the values of $\Delta S^{\circ }$, $\Delta H^{\circ }$ for this reaction is given. The value of $\Delta G^{\circ }$ at $298\text{K}$ is to be calculated. The temperature at which $\Delta G^{\circ }=0$ is to be calculated. If $\Delta G^{\circ }$ is negative above or below this temperature is to be stated.

Concept introduction: The expression for $\Delta G^{\circ }$ is,

$\Delta G^{\circ }=\Delta H^{\circ }-T\Delta S^{\circ }$

A reaction is said to be spontaneous if the value of $\Delta G$ is negative.