Chapter 3, Problem 3.62E

Interpretation Introduction

Interpretation:

The molar entropy change for the reaction, $\text{C}\left(\text{solid,}\text{graphite}\right)\to \text{C}\left(\text{solid,}\text{diamond}\right)$, is to be calculated. Based on the known structures of graphite and diamond, the sign on $\Delta S$ is to be justified.

Concept introduction:

The change in entropy of a reaction is given by the formula written below.

$\Delta S{°}_{\text{rxn}}^{}={\displaystyle \sum _{\text{Products}}S°}-{\displaystyle \sum _{\text{Reactants}}S°}$

Thus, the molar entropy change of a reaction is taken as the value obtained by subtracting the sum of the entropy of reactants from the sum of the entropy of products.