The EMF of the standard weston cadmium cell Cd (12.5%) in Hg | 3CdSO 4 , 8H 2 O (solid) | saturated solution of CdSO 4 || Hg 2 SO 4 (s) | Hg is 1.0180 volts at 25° C and the temperature coefficient of the cell, 
= – 4.0 × 10 –5 V/degree. Calculate Δ G, Δ H and Δ S for the reaction in the cell when n = 2.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
Δ G = – 196.5 kJ ; Δ H = 198.8 kJ ; Δ S = – 7.72 J d eg–1
Sol. Cd (12.5%) in Hg / 3Cd SO 4 , 8H 2 O (solid) / satd sol of CdSO 4 || Hg 2 SO 4(s) | Hg, E = 1.018 volt
= – 4 × 10 –5 volt d eg–1.
Δ G = – nEF = – 2 1.018 × 96500 = – 196.474 kJ
Δ S = nF. 
= 2 × 96500 × (– 4 × 10 –5 ) = – 7.72 JK –1 .
Δ G = Δ H – T Δ S
Δ H = – 196.474 + 
= – 196.474 – 2.3 = 198.774 kJ
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