Calculate the standard cell potential (in V) of the cell in which following reaction takes place : $$ \mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{Ag}(\mathrm{~s}) $$ Given that $$ \begin{aligned} & \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^0=\mathrm{xV} \\ & \mathrm{E}_{\mathrm{Fe}^{2+/ \mathrm{Fe}}}^0=\mathrm{yV} \\ & \mathrm{E}_{\mathrm{Fe}^{3+/ \mathrm{Fe}}}^0=\mathrm{zV} \end{aligned} $$