Chapter 11, Problem 56E

Consider the following galvanic cell at 25°C:
${\text{Pt|Cr}}^{\text{2+}}\text{(0}\text{.30}M{\text{), Cr}}^{\text{3+}}\text{(2}\text{.0}M\text{)}\left|\right|{\text{Co}}^{\text{2+}}\text{(0}\text{.20}M\text{)|Co}$
The overall reaction and equilibrium constant value are
$\begin{array}{l}{\text{2Cr}}^{\text{2+}}\text{(}aq{\text{)+Co}}^{\text{2+}}\text{(}aq\text{)}\to \\ {\text{2Cr}}^{\text{3+}}\text{(}aq\text{)+Co(}s\text{)}K\text{=2}{\text{.79×10}}^{\text{7}}\end{array}$
Calculate the cell potential for this galvanic cell and $\Delta G$ for the cell reaction at these conditions.