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Aspirin or acetyl salicylic acid is synthesized by reacting salicylic acid with acetic anhydride:
C7H6O3 + C4H6O3 → C9H8O4 + C2H4O2
salicylic acid acetic anhydride aspirin acetic acid
(a) How much salicylic acid is required to produce 0.450 g of aspirin, assuming acetic anhydride is present in excess?
(b) Calculate the amount of salicylic acid needed if only 72.8 percent of salicylic acid is converted to aspirin.