Direct Reaction of P with Cl₂ Can Form PCl₅

Direct reaction of P with Cl₂ can form PCl₅. How many molecules of Cl₂ will be consumed in forming 0.20 moles of PCl₅?

A) 0.50 molecules
B) 3.0×10²³ molecules
C) 6.0×10²³ molecules
D) 1.5×10²⁴ molecules
E) none of these