You add 2.202 g salicylic acid to a 125 mL Erlenmeyer flask. You
add 4.0 mL acetic anhydride and 5 drops of sulfuric acid. After
completing the synthesis, filtering, you place the crystals to dry
on an evaporating dish that weights 22.067 g. After drying, the
crystals and evaporating dish weigh 24.452 g. Calculate the percent
yield of aspirin.