An electrolytic lead refinery makes 200 T refined lead per day. Current density is 200 A/m2, parallel system. Anodes and cathodes (immersed portion) are 50 x 80 cm. There are 20 anodes and 21 cathodes in each tank. The ampere efficiency of deposition is 93 %. Volts per tank is 0.4. Distance from anode to cathode is 3 cm. Given: At wt of Pb = 207.2 g/mol Find: (i) The average number of tanks in operation (ii) The power required of the generator (iii) The resistivity of the electrolyte