How many coulumbs of charge are required to produce 1 kg of Al metal from Al2O3??

Question

Also what's a coulumb?

Answer 1

I thought they told you what a coulumb is in your text book.  It is a unit of a certain number of electrons (lots of them), but has a specific definition.  

Back to the problem, divide 1000 gram of Al by 27 to get the "moles" of aluminum.  Now each "mole" contains 6.02x10^23 atoms, so you compute atoms in 1 kg.  Now each atom requires 3 electrons to go to an elemental state.  So multiply the atoms in1 kg by 3.  Now divide that by the electrons per columb to get your answer.