The standard Gibbs energy for the given cell reaction in $\mathrm{kJ}{\mathrm{mol}}^{-1}\text{ at }298\mathrm{K}\text{ is: }$
$\mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)\to {\mathrm{Zn}}^{2+}\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$
${\mathrm{E}}^{\circ }=2\mathrm{V}\text{ at }298\mathrm{K}$
(Faraday's constant, F = 96000 C mol^-l)