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Suppose you need to produce 25.0 g of pure copper by electrolysis of a solution of CuSO4(aq), by the reduction, Cu2+(aq) + 2 e- → Cu(s). How much time will it take with a current of 3.00 A? Coulombs = Amps x seconds. Faraday’s constant is 9.65 x 104 C/(mol e-) and the molecular weight of Cu is 63.5 g/mol.