Complete the following:

A. How many Fe atoms are in 0.45 moles of Fe atoms?

B. How many moles of H₂O molecules are in 1.73 X 10³¹ water molecules?

C. How many Na₂S formula units are in 6.2 moles of Na₂S F.U.'s?

D. How many ions are in 6.2 moles of Na₂S formula units?