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Question

For a cell Mg(s)|Mg2+(aq)||Ag+(aq)|Ag, find the maximum work (in kJ) that can be obtained by operating the cell.
Eo(Mg2+/Mg)=2.37 V, Eo(Ag+/Ag)=0.8 V

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Solution

Mg(s)+2Ag+Mg2++2Ag
Given, EoMg2+/Mg=2.37 V
Eo(Ag+/Ag)=0.8 V
Eocell=EocathodeEoanode
Eocell=2.37+0.8=3.17 V
Again, maximum work obtained =nfEocell=2×96500×3.17 =611810 J=611.81 kJ

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