ok so you have 1.76g of salicyic acid(138.12 g/mol) and with 1.11 g of acetic anhydride(102.10 g/mol) a student obtained 1.12g of acetylsalicylic acid( 180.17 g/mol) what is the percentage yield?

Answer 1

Do you know how to determine which is the limiting reagent? Do that.
Convert grams of the limiting reagent (LR)to mols of the LR then use the coefficients in the balanced equation to convert mols LR to mols of the product. That is the theoretical yield (TY).

Then %yield = (actual yield/TY)*100 = ?