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 298 g was collected from the reaction of 75.37 g of P4 with excess chlorine. What is the percentage yield of the reaction?