Chapter 19, Problem 31E

Interpretation Introduction

Interpretation:

Theoretical voltage of the silver-zinc button cell should be calculated using thermodynamics data.

Concept introduction:

In the special case, where reactants and products are in their standard states; the standard Gibbs energy change per mole of reaction is given by;

${\text{Δ}}_{\text{r}}{\text{G}}^{\text{0}}{\text{ = -zFE}}^{\text{0}}{}_{\text{cell}}$

Here, z is number of electrons transferred, F is Faraday’s constant and ${\text{E}}^{\text{0}}{}_{\text{cell}}$ is electrode potential.

The value of change in Gibbs free energy of reaction is calculated as follows:

${\text{Δ}}_{\text{r}}{\text{G}}^{\text{0}}$ = ${\text{ΔG}}^{\text{0}}$ (products) - ${\text{ΔG}}^{\text{0}}$ (reactants)