Chem Question for serious thinkers...?

The percent yield for the reaction

PCl(subscript 3) (l) + Cl(subscript 2) (g) yields PCl (subscript 5) (s)

is 83.2%. What mass of PCl (sub 5) would be expected from the reaction of 56.7g of PCl with excess chlorine?

A) 65.4g
B) 86.1g
C) 71.6g
D) 54.2g
E) 47.8g

Answer:
C) 71.6 g
huh?
71.6

gotta use molar ratios

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