Mg(s) | Mg2+(0.001M) || Cu2+(0.0001 M) | Cu(s)

EMg2+/Mgo=-2.36 V; ECu2+/Cuo=0.34V

The value of Ecell  for the above reaction is -

1. 3.46 V  2. 3.15 V
3. 2.67 V 4. 1.24 V
Hint: Ecell=Ecell-0.0591nlog[Mg2+][Cu2+]
Step 1:
Calculate the value of Ecello as follows:
Ecell =EMg/Mg2+o+ECu2+/Cuo
Ecell =2.36 + 0.34 V
Ecell =2.70 V
Step 2:
Calculate the value of Ecell  as follows:

Ecell=Ecell-0.0591nlog[Mg2+][Cu2+]

={0.34-(-2.36)}-0.05912log.001.0001

=2.7-0.05912log10

=2.7 - 0.02955

=2.67 V (approximately)