(a) Calculate ΔrG0 for the reaction Mg(s) + Cu2+(aq) → Mg2+(aq) + Cu(s). Given: E0cell = 2.71V, 1F = 96500 Cmol⁻¹. (b) Name the type of cell that was used in Apollo space program for providing electrical power.

(a) For the cell reaction, Mg(s) + Cu2+(aq) → Mg2+(aq) + Cu(s); Eocell = +2.71V
The change in the standard Gibbs free energy is given as:
ΔrGo = -nFEocell = -2 × 96500 × 2.71 = -523030 Jmol⁻¹
(b) The fuel cell which uses the reaction of hydrogen with oxygen to form water was used in Apollo space programme for providing electrical power.