Chapter 18, Problem 18.27QP

Interpretation Introduction

Interpretation: The products of a reaction are given to have, overall, greater entropy than the reactant under standard conditions. The sign of $\Delta S_{\text{rxn}}^{°}$ is to be stated.

Concept introduction: Entropy is a thermodynamic property which shows the randomness or disorder of the atoms within the system.

The difference in the entropy of the reactant and products is known as the change in the entropy of a reaction $\Delta S_{\text{rxn}}^{°}$.

The entropy of a reaction is calculated by the formula,

$\Delta S_{\text{rxn}}^{°}={\displaystyle \sum n_{\text{products}}{S}_{\text{products}}^{°}}-{\displaystyle \sum n_{\text{reactants}}{S}_{\text{reactants}}^{°}}$

To determine: The sign of $\Delta S_{\text{rxn}}^{°}$ when products of a reaction have greater entropy than the reactant under standard conditions.