[Tony30]

Aspirin, C9H8O4, is prepared by reacting salicylic acid, C7H603, with acetic anhydride, C4H603. Water is a byproduct. A student is to prepare 25.0 grams of aspirin using a 50.0 % excess of acetic anhydride while exepecting a 65.0% yeild. How many grams of each ractant should the student use.

[macman104]

1)  Start by writing a balanced equation.
2)  You know you want 25.0 grams of aspirin, how many moles is that?
3)  Now, you are only operating at 65% yield, which means that, let's say you want 65 moles produced, how many moles do you actually need to try to produce to achieve 65%?