Calculate the standard cell potential (in V) of the cell in which following reaction takes place :

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

$\mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{0}=x \mathrm{~V}$

$\mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{0}=y \mathrm{~V}$

$\mathrm{E}_{\mathrm{Fe}^{3+} / \mathrm{Fe}}^{0}=z \mathrm{~V}$