Do this for a single molecule of the compound. Benzocaine 0692 g. So the theoretical yield is 133 grams.
Given that the chemical formula for salicylic acid is C 7 H 6 O 3 and the chemical formula for aspirin is C 9 H 8 O 4.
This ScienceStruck article explains how to calculate the percent recovery of any purified substance. So to stop you from wondering how to find theoretical yield here is the theoretical yield formula. 1 mole of salicylic acid gives 1 mole of aspirin. So what ever weight of benzoic acid you actually gotdivide this by the theoretical yield in this case 133 amd multiply by 100 to get the reaction.