The most useful ore of aluminum is bauxite, in which al is present as hydrated oxides, al2o3 * xh2o.
a) the number of kilowatt-hours of electricity required to produce 3.00kg of aluminum from electrolysis of compounds from bauxite is when the applied emf is 5.00 v.

44.7 kWh

Explanation:

Let's consider the reduction of Al₂O₃ to Al in the Bayer process.

6 e⁻ + 3 H₂O + Al₂O₃ → 2 Al + 6 OH⁻

We can establish the following relations:

When the applied electromotive force is 5.00 V, the energy required to produce 3.00 kg (3.00 × 10³ g) of aluminum is:

neutrons are in the middle of the atom and the electrons, which are much smaller.