A button cell used in watches functions as following Zn ( s )+ Ag_2 O ( s )+ H_2 O ( l ) ⇌ 2 Ag ( s )+ Zn^2+( aq )+2 OH^-( aq ) If half cell…

A button cell used in watches functions as following $$\begin{aligned} & \mathrm{Zn}(\mathrm{~s})+\mathrm{Ag}_2 \mathrm{O}(\mathrm{~s})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightleftharpoons 2 \mathrm{Ag}(\mathrm{~s})+ \\ & \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq}) \end{aligned} $$ If half cell potentials are $$\begin{aligned} & \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Zn}(\mathrm{~s}) ; \mathrm{E}^{\circ}=-0.76 \mathrm{~V} \\ & \mathrm{Ag}_2 \mathrm{O}(\mathrm{~s})+\mathrm{H}_2 \mathrm{O}(\mathrm{l})+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{Ag}(\mathrm{~s})+2 \mathrm{OH}^{-}(\mathrm{aq}), \\ & \mathrm{E}^{\circ}=0.34 \mathrm{~V} \end{aligned} $$ The cell potential will be :