Consider the following cell reaction 
$\begin{array}{r}2\mathrm{Fe}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)+4{\mathrm{H}}^{+}\left(\mathrm{aq}\right)⟶ \\ 2{\mathrm{Fe}}^{2+}\left(\mathrm{aq}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right),{\mathrm{E}}^{\circ }=1.67\mathrm{V}\end{array}$
$\mathrm{At} \left[{\mathrm{Fe}}^{2+}\right]={10}^{-3}\mathrm{M},{\mathrm{p}}_{{\mathrm{O}}_2}=0.1\mathrm{atm} \mathrm{and} \mathrm{pH}=3,$the cell potential at 25^oC is