3.146 Aspirin or acetylsalicylic acid is synthesized bycombining salicylic acid with acetic anhydride:C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2salicylic acid acetic anhydride aspirin acetic acid(a) How much salicylic acid is required to produce0.400 g of aspirin (about the content in a tablet), assumingacetic anhydride is present in excess? (b) Calculate theamount of salicylic acid needed if only 74.9 percent of salicylic is converted to aspirin. (c) In one experiment,9.26 g of salicylic acid reacts with 8.54 g of aceticanhydride. Calculate the theoretical yield of aspirin andthe percent yield if only 10.9 g of aspirin is produced.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".