Posted by Diana on .
How many hours will it take to produce 78.0 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.00 Amperes? [Enter only a number for your answer.]

Chemistry 
DrBob222,
78.0 g Al.
96,485 coulombs will reduce 26.98/3 g Al or 96,485 C will reduce approximately 9 g (but you need to do it more accurately). We want to reduce 78.0; therefore, we will need
96,485C x 78.0/9 = about 836,200 C.
Amperes x seconds = C
Substitute and solve for seconds, then convert to hours.