In the synthesis of asprin we react salicylic acid (HOOCC6H4OH) with acetic anhydride (C4H6O3) . The unbalanced chemical equation is:

HOOCC6H4OH + C4H6O3 --> HOOCC6H4O2C2H3 + H2O

If we mix together 28.2 g of salicylic acids with 15.6 g of acetic anhydride in this reaction we obtain 30.7 grams of asprin. What is the percent yield for this reaction?