Chapter 19, Problem 31QP

Calculate the standard potential of the cell consisting of the ${\text{Zn/Zn}}^{\text{2-}}$ half-cell and the SHE. What will the emf of the cell be if $\left[{\text{Zn}}^{\text{2-}}\right]\text{ = 0}\text{.45 }M{\text{, P}}_{{\text{H}}_{\text{2}}}\text{= 2}\text{.0 atm, and }\left[{\text{H}}^{\text{-}}\right]\text{ = 1}\text{.8 }M\text{?}$