Question

The e.m.f. of the following cell reaction is  0.6753 V at 25 ℃ and 0.6915 V at

0 ℃.

Cd(s) | CdCl₂.5H₂O(saturated) || AgCl(s) | Ag(s)

(i) Give the balance for the cell reaction

(ii) Calculate the free energy G, enthalpy H and entropy S, change of the cell reaction at 25 ℃.   

Answer 1

Cd⁰ -2e = Cd⁺²

2H⁺+2e = H₂

at 25⁰C G = 130.3kJ, H = 93.06kJ/mol

S = -125 J/molK