Chapter 18, Problem 16QP

Interpretation Introduction

Interpretation:

The substance with larger standard entropy value from the given pairs is to be determined.

Concept introduction:

Entropy is a measure of the disorder or randomness within the molecules of a system. Entropy of a substance increases with increase in molecular weight, complexity, and temperature. It also increases with the decrease in pressure and concentration.

For the chemical reaction below:

$\text{aA+bB}\to \text{cC+dD}$

The change in entropy is as follows:

$\Delta {\text{S}}^{\circ }{}_{\text{rxn}}{\text{ = dΔS}}^{\text{o}}\left(\text{D}\right)\text{+c}\text{}{\text{ΔS}}^{\text{o}}\left(\text{C}\right){\text{-aΔS}}^{\text{o}}\left(\text{A}\right){\text{-bΔS}}^{\text{o}}\left(\text{B}\right)$

Here, ${\text{ΔS}}^{\text{o}}$

is the change in entropy for the reaction.