You want to use electrolysis to plate a cylindrical object (radius = 2.50 and length = 20.00 cm) with a coating of nickel metal, 4.0 mm thick. You place the object in a bath containing a salt (Na₂SO₄). One electrode is impure nickel, and the other is the object to be plated. The electrolyzing potential is 2.50 V.
(a) Which is the anode and which is the cathode in the experiment? What half-reaction occurs at each electrode?
(b) Calculate the number of kilowatt-hours (kWh) of energy required to carry out the electrolysis. (1 kWh = 3.6 × 10⁶ J and 1 J = 1 C ×1 V)