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Solid molecular phosphorous reacts with chlorine gas to form phosphorus trichloride according to the chemical equation shown below. If only 5.9 grams of PCl3 are produced when 5.0 grams of P4 and 7.5 grams of Cl2 are combined, what is the percent yield of the reaction? P4 (s) + 6 Cl2 (g) = 4 PCl3 (l)