In the button cells widely used in watches and other devices the following reaction takes place:
Zn(s)+Ag2O(s)+H2O(l)→Zn2+(aq)+2Ag(s)+2OH−(aq)
Determine ΔrGθ and Eθ for the reaction.
E0cell=E0cathode−E0anode=EoAg−EoZn=0.344−(−0.76)=1.104 V
ΔG0=−nFE0cell=−2×96500×1.104=−213072J=−213kJ