Exercise 8 | Electrochemistry
Calculate ΔGrxn of the reaction: Zn (s) + Cu2+ (aq) → Zn 2+ (aq) + Cu (s) knowing that the measured cell voltage at 25°C is 1.12 V.
ΔGrxn = - νeFEcell
νe = stoichiometric coefficient of the electrons = 2
F = Faraday’s constant = 96485 C.mol-1
Ecell = electromotive force emf of the cell = 1.12 V
ΔGrxn = - 2 x 96485 x 1.12 = - 216 kJ.mol-1