Chapter 19, Problem 22QP

The equilibrium constant for the reaction:

$\text{Sr}\left(s\right){\text{ + Mg}}^{\text{2+}}\left(aq\right)\underset{}{\rightleftarrows }{\text{Sr}}^{\text{2+}}\text{(}aq\text{)+ Mg}\left(s\right)$

is $\text{2}\text{.69 }\times {\text{ 10}}^{\text{12}}{\text{ at 25}}^{\text{0}}\text{C}$. Calculate $E°$ for a cell made up of ${\text{Sr/Sr}}^{\text{2+}}{\text{ and Mg/Mg}}^{\text{2+}}$ half-cells.