The Most Useful Ore of Aluminum Is Bauxite,in Which Al

Multiple Choice

The most useful ore of aluminum is bauxite,in which Al is present as hydrated oxides,Al₂O₃ ∙ xH₂O.The number of kilowatt-hours of electricity required to produce 4.00 kg of aluminum from electrolysis of compounds from bauxite is ________ when the applied emf is 5.00 V.

A) 0.0168
B) 0.0596
C) 39.7
D) 19.9
E) 59.6