Given :

(i) Cu⁺² +2e^-$\to$Cu, E⁰ = 0.337V (ii)  Cu⁺²+e^-$\to$Cu⁺, E⁰ = 0.153V Electrode potential, E⁰ for the reaction,Cu⁺ + e^-$\to$Cu, will be

 

Electrodepotentials are intensive properties and can't be added. Converted into extensive properties  using

Required equation is obtained by sutracting 2 from1 and simplifying

nE = n₁E₁ - n₂E₂