G = -RT*lnK
since K = Ksp
then
G = -8.314*298*ln(K)
Grxn = -nF*E°cell
Al3+(aq) + 3e– → Al(s) –1.66
Cd2+(aq) + 2e– → Cd(s) –0.403
E°cell = Ered - Eox = -0.403 + 1.66 = 1.257V
GRxn = -6*96500*(1.257) = -727803 J/molK
G = -8.314*298*ln(K)
-727803 = -8.314*298*ln(K)
K = exp(727803/(8.314*298)) = 3.7744*10^127
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