(a) Calculate the charge in coulombs required for oxidation for 2 moles of water to oxygen. [Given $IF= 96,500\;c\;mol^{-1}$] (b) Zinc / Silver oxide cell is used is hearing aids and electric watches . The following reaction occur. $Zn(S) \to Z_n^{2+} (aq)+2e^{-} E^0_{Zn^{2+}/Zn}=-0.76\;V \\ Ag_20+H_2O+2e^{-} \to 2Ag +2 OH - E^0_{Ag^{+}/Ag}=0.344\;V$ Calculate (i) Standard potential of the cell (ii) Standard Gibbs energy .

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