how many moles of copper (Cu) would be needed to produce 8 moles of copper (II) oxide (Cu2O)?

Answer 1

Since Copper (II) Oxide Cu2O has two Copper atoms for each molecule, there are two moles of Copper for every mole of Cu2O. Therefore 8 moles of Copper Oxide would contain 16 moles of Copper (8 x2 = 16).

Answer 2