Chemistry Homework Solutions
Problem
#61684

What they mean by use 55.0% excess of acetic anhydride?

What they mean by use 55.0% excess of acetic anhydride?

Please provide the solutions that I can follow along.

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Aspirin.doc  View File

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Aspirin.doc
Aspirin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with
acetic anhydride C4H6O3, in the reaction

C7H6O3(s) + C4H6O3(l) ( C9H8O4 + C2H4O2(l)

A student is told to prepare 45.0g of aspirin. She is also tole to use
55.0%exess of acetic anhydride and to expect to get an 85% yield in the
reaction. How many grams of each reactant should she use?
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