Aspirin (C9H8O4) is prepared by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3) according to the balanced equation:
C7H6O3(s) + C4H6O3(l) → C9H8O4(s) + C2H4O2(l)
A student is asked to prepare 90.08 g of aspirin. She is told that salicylic acid is the limiting reagent and that the reaction typically has a 53.9% yield. She is also told to use a 42.0% excess of acetic anhydride. How many grams of acetic anhydride should she use? Round your final answer to three significant figures.
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