Chapter 18, Problem 18.90QP

Interpretation Introduction

Interpretation:

From the data given the value of standard entropy $\left({\text{S}}^{\text{o}}\right)$ per mole ${\text{O}}_{\text{3}}{}_{\left(\text{g}\right)}$ has to be calculated.

Concept introduction:

Standard free energy change:

Standard free energy change is measured by subtracting the product of temperature and standard entropy change from the standard enthalpy change of a system.

$\begin{array}{l}{\text{ΔG}}^{\text{o}}\text{=}{\text{ΔH}}^{\text{o}}\text{-}{\text{TΔS}}^{\text{o}}\\ \text{where,}\\ {\text{ΔG}}^{\text{o}}\text{-}\text{standard}\text{free}\text{energy change}\\ {\text{ΔH}}^{\text{o}}\text{-}\text{standard}\text{enthalpy}\text{change}\\ {\text{ΔS}}^{\text{o}}\text{-}\text{standard}\text{entropy change}\text{and T}\text{-}\text{temperature}\text{.}\end{array}$

Entropy:

Entropy is a measure of randomness (disorder).  If the randomness of a system increases then its entropy will increase.