Kilojoules...Chemistry electrolysis?

Question

Zn(s) + Cu2+(aq) Zn2+(aq) +Cu(s)
Under standard conditions, what is the maximum electrical work, in kilojoules, that the cell can accomplish if 40.9 g of copper are plated out?

Answer 1

Find the standard cell potential (V). Multiply by the total charge required to plate out 40.9 g Cu (remember that each mol Cu requires 2 Faradays of charge).

Principle: Energy = volts x coulombs. Since this is electrical energy, it is all Gibbs free energy, available to do work.