Chapter 17, Problem 29QAP

Calculate E° for the following voltaic cells:
(a) ${\text{MnO}}_2+4{\text{H}}^{+}\left(aq\right)+2{\text{I}}^{-}\left(aq\right)\to {\text{Mn}}^{2+}\left(aq\right)+2{\text{H}}_2\text{O}+{\text{I}}_2\left(s\right)$
(b) ${\text{H}}_2\left(g\right)+2{\text{OH}}^{-}\left(aq\right)+\text{S}\left(s\right)\to 2{\text{H}}_2\text{O}+{\text{S}}^{2-}\left(aq\right)$
(c) an Ag-Ag+ half-cell and an Au-AuCl₄- half-cell