Question 37:What is the standard free energy change for the following reaction at room temperature? Is the reaction spontaneous? Sn(s) + 2Cu2+ (aq) à Sn2+ (aq) + 2Cu+ (s) The correct answer is -F = 96500C, n=2, Sn2+ (aq) + 2e– → Sn(s) –0.14V Cu2+(aq) + e- Cu+ (aq) 0.15 V Eocell = Eocathode – Eo anode = 0.15 – (-0.14) = 0.29V ΔGo = -nFEo cell = -2 x96500x 0.29 = 55970 J/mol
