Phosphorous trichloride (PCl3) is produced from the reaction of white phosphorous (P4)
and chlorine: P4(s) + 6 Cl2(g) → 4 PCl3(g). A sample of PCl3 of mass 307.4 g was collected from the reaction of 73.76 g of P4 with excess chlorine. What is the percentage yield of the reaction? Answer in units of %.