How many coulombs are required to produce 638 g of potassium

How many coulombs are required to produce 63.8 g of potassium metal from a sample of molten potassium chloride?

each electron has 1.6x10^-19C charge

atomic weight of K =39g/mol so63.8g = 63.8/39 = 1.635moles

each mole has 6.022x10^23 atoms of K

1.635 moles =9.85x10^23 atoms

1 electrons off each atom, so 9.85x10^23 x 1 x 1.6x10^-19 =

1.576 Million Coulombs, or 1.576 Megacoulombs