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The Edison storage cell is represented as \( \mathrm{Fe}(\mathrm{s})|\mathrm{FeO}(\mathrm{s})| \) \( \mathrm{KOH}(\mathrm{aq})\left|\mathrm{Ni}_{2} \mathrm{O}_{3}(\mathrm{~s})\right| \mathrm{Ni}(\mathrm{s}) \) the half cell reaction are:
\[
\begin{array}{l}
\mathrm{Ni}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}(l)+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{NiO}(\mathrm{s})+2 \mathrm{OH}^{-} \\
\mathrm{E}^{0}=+0.40 \mathrm{~V} \\
\mathrm{FeO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(l)+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}(\mathrm{s})+2 \mathrm{OH}^{-}, \\
\mathrm{E}^{\mathrm{o}}=-0.87 \mathrm{~V}
\end{array}
\]
What is the cell e.m.f.?
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