First slide
Standard EMF of a cell
Question

Ecello of the reaction is Zn(s)+Cu2+(aq)Zn2+aq+Cu(s);
If EZn2+/Zno=-0.76,ECu2+/Cuo=0.34V

Easy
Solution

For the given reaction,
Ecello=ECu2+/Cuo-EZn2+/Zno         =0.34--0.76=+1.10V

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