chemistry

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Can somebody point out the step i have to take to solve this problem. It would be much appreciated. Thanks a lot!!!!
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Asprin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride, C4H6O3, in the reaction:

C7H6O3 + C4H6O3 ---> C9H8O4 + C2H4O2

A student is told to prepare 45.0 g asprin. She is also told to use a 55% excess of acetic anydride and to expect to get an 85% yeild in the reaction. How many grams of each reactant should she use?

  • chemistry -

    Balance the equation.

    consider a mass of 55(1/.85) g of aspiring as the product, determine the moles of aspirin. Using the coefficents, determine the moles of each reactant, and for the acetic anydride, multiply it by 1.55

  • chemistry -

    ok thanks!!

  • chemistry -

    wait isn't the equation already balanced?

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