The standard cell potential at 25 °C is 0.90 V for the reaction
2Al (s) + 3Zn 3+ (aq) → 2Al 3+ (aq) + 3Zn (s)
Calculate the standard free-energy change for this reaction at 25 °C.
Use this equation,
∆ G° = nFE°
F(Faraday constant)= 96,500 C /mol e-
n can be inferred from the balanced chemical equation.