Chapter 13, Problem 38E

Interpretation Introduction

Interpretation:

The value of ${\text{Δ}}_r{\text{G}}^o$ at 298 K for the given reaction and whether this reaction is favored at temperatures below or above 298 K should be determined.

Concept introduction:

The Gibb’s equation of thermodynamic purposed a relation between $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$ with temperature. The mathematical expression of Gibb’s equation can be written as:

$\text{ΔG = ΔH - TΔS }$

With the help of this equation, the change in $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$ can be predicted.

For any reaction the $\text{ΔH}$ and $\text{ΔS}$ can be calculated with the help of:

$\begin{array}{l}\text{ΔrS°= }\Sigma \text{ΔrS°product - }\sum \text{ΔrS°reactant}\\ \text{ΔrH°= }\Sigma \text{ΔrH°product - }\sum \text{ΔrH°reactant}\end{array}$