Write Nernst equation to calculate cell potential of above cell 
Mg (s) | Mg2+ (aq) || Ag+ (aq) | Ag (s)

Dear student
Please find the solution to the asked query:

Reactions  Mg is oxidised to Mg2
Mg(s) =>  Mg2 +(aq)  + 2e- 
  Ag+  is reduced to Ag
[Ag+ (aq)  + e-  =>  Ag(s)] x 2

Nernst equation E =  Eo - RT x 2.303/2F log[Mg2+]/[Ag+]2

where,
E0 = cell potential under standard conditions
R = gas constant
T = temperature (K)
n = number of moles of electrons exchanged in the electrochemical reaction (mol) ans equals 2 in this case
F = Faraday's constant

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