Chapter 17, Problem 17.7P

Interpretation Introduction

Interpretation:

From the balanced equation we can calculate $\Delta S^o$ for the reaction

Concept introduction:

The entropy change in a chemical reaction is given by the sum of the entropies of the products minus the sum of the entropies of the reactants

$\Delta S^o=\sum n\Delta S^o(products)-\sum m\Delta S^o(reactants)$

Standard entropy of

$\Delta S^{o}forCaC{O}_3(s)=91.7J{K}^{-1}mo{l}^{-1}$

$\Delta S^{o}forCaO(s)=38.2J{K}^{-1}mo{l}^{-1}{}^{}$

$\Delta S^{o}forC{O}_2(g)=213.8J{K}^{-1}mo{l}^{-1}{}^{}$

Given:

$CaC{O}_3(s)\stackrel{}{\to }CaO(s)+C{O}_2(g)$

To determine:

To determine the standard entropy of the reaction at 25^o C for the decomposition of calcium carbonate.