Answer:
PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.
Step-by-step explanation:
Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]