What do they mean by using 55.0% excess of acetic anhydride?
Stoichiometry Problem with Aspirin: Mole/Mole and Percent Yield
Aspirin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride C4H6O3.
C7H6O3 + C4H6O3 -----> C9H8O4 + C2H4O2
Prepare 45.0g of aspirin. Use 55.0% excess of acetic anhydride and expect 85% yield in the reaction. How many grams of each reactant should we use?
Solution: We need to work backwards from 45.0 grams of aspirin. ...
55.0% excess of acetic anhydride is explained using various equation examples.