Percent yield question

Question

In the reaction of  g of salicylic acid (138.12 g/mol) with  g of acetic anhydride (102.10 g/mol), a student obtained  g of acetylsalicylic acid (180.17 g/mol). What is the percent yield?

Answer 1

You take the grams ASA obtained experimentally divided by the mass you'd expect theoretically by solving the limiting reactant problem (Theoretical yield), and multiply by 100 to obtain %. If you were given the initial grams of SA and AA, you could figure out the mass of ASA expected from each mass (g of i -->mole of i--> mole of j--> gram of j - usual 3-step calculation). The reactant that give less ASA is the limiting reactant and the amount calculated is the theoretical yield of ASA.

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