Two half-reactions of an electrochemical cell are given below:
MnO4- (aq) + 8 H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (l), Eo = +1.51 V,
Sn2+ (aq) → Sn4+ (aq) + 2e–, Eo = +0.15 V.
Construct the redox reaction equation from the two half-reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured.