Chapter 18, Problem 55E

Interpretation Introduction

Introduction: The standard entropy change of a chemical reaction is equal to the difference of standard entropies of reactants multiplied by their stoichiometric coefficients and the standard entropies of product multiplied by their coefficient.

 $\Delta S^{\circ }{}_{rxn}=\Sigma n_p{S}^{\circ }\left(products\right)-\Sigma n_f{S}^{\circ }\left(\mathrm{reactants}\right)$

Here, n_p is the stoichiometric coefficient of product, $n_f$ is stoichiometric coefficient of reactants, and $S^{\circ }$ is standard entropy.