How many moles of phosphorus pentachloride are present in 7.85 x 1020 molecules of this compound?

How many MOLECULES of phosphorus pentachloride are present in 3.96 moles of this compound? molecules. How many MOLES of phosphorus pentachloride are present in 7.85 times 10^20 molecules of this compound? moles.

a. How many molecules of carbon tetrachloride are present in 3.74 moles of this compound:? molecules b. How many moles of c arbon tetrachloride are present in 8.94 × 1020 molecules of this compound? moles