Given the standard electrode potentials

Fe^3+(aq) + 1 e → Fe^2+(aq) E0 = +0.771 V
I2(s) + 2 e → 2 I^−(aq) E0 = +0.535 V

calculate Kc at 25◦C for the reaction

2 Fe^2+(aq) + I2(s) → 2 Fe^3+(aq) + 2 I^−(aq)

Question

Given the standard electrode potentials 

Fe^3+(aq) + 1 e → Fe^2+(aq) E0 = +0.771 V 
I2(s) + 2 e → 2 I^−(aq) E0 = +0.535 V 

calculate Kc at 25◦C for the reaction 

2 Fe^2+(aq) + I2(s) → 2 Fe^3+(aq) + 2 I^−(aq)

cuanchi · Answer

Ecell=RT lnK/nF
where

R = 8.314  J mol/K
T = Temp in K
n = moles of e- from balanced redox reaction
F = Faraday's constant  = 96,485 J/mol