The standard Gibbs free energy change (ΔG°) for a reaction is -249.5 kJ/mol. The corresponding standard cell potential (E°cell) at 25°C is:
Correct: A
Using ΔG° = -nFE°cell. Given ΔG° = -249,500 J/mol, F = 96,500 C/mol, solve for E°cell. Assume n=2 (common for two electrons). E°cell = -ΔG°/(nF) = 249,500/(2*96500) ≈ +1.3 V. Closest choice is +1.25 V.