What is the percent yield of hcl if 42.0 g of hcl are produced from the reaction of 62.0 g of pcl3

For every mole of phosphorous trichloride, there are three moles of HCl. Converting to mass 1 gram of  phosphorous trichloride, 0.7961 grams of HCl. Hence, for 62.0 grams of PCl3, there are 49.36 grams of HCl produced. The actual yield is 42.0 grams of HCl. The yield is 42/49.36 or equal to 85.10 %.

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