Chapter 17, Problem 93AE

Interpretation Introduction

Interpretation: The reaction between ${\text{Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(s\right)$ and ${\text{H}}_{\text{2}}\left(g\right)$ is given. The temperature at which the value of $K$ is $1.00$ is to be calculated.

Concept introduction: The expression for free energy change is,

$\Delta G°=-RT\ln \left(K\right)$

And,

$\Delta G°=\Delta H°-T\Delta S°$

Hence,

$\Delta H°-T\Delta S°=-RT\ln \left(K\right)$