Electrolytic Cells + Amperes?

Question

Commercial electrolytic cells for producing aluminum operate at 5 volts and 100,000 Amperes. How long does it take to produce 1000 kilograms of aluminum? If electricity costs 9 cents per kilowatt hour, what is the cost of producing exactly 1 pound of aluminum?

Answer 1

Moles of Al = 10^6/27

Charge = 10^6/9 F

Time = 10^6*96500/(9*10^5) = 107222.22 s = 29.78 hours