For the reaction taking place in the cell:

The value of is . (in nearest integer)

Question

For the reaction taking place in the cell:

The value of  is . (in nearest integer)

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Strategy:
 Relate the cell potential to the standard Gibbs energy of formation (). Note that the cell reaction involves the formation of  (standard gas to ion) and  (ion to solid).

Step 1: Identify the cell reaction
Anode: 
Cathode: 
Net: , .

Step 2: Relate  to potentials
Assuming  and all concentrations :

Step 3: Find formation energy

Since  for elements and  is zero:

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