Any help is greatly appreciated! If aspirin reaction is carried out with a 95% yield, how much salicylic acid is needed to produce 90.0 g of aspirin?
SA ==> ASA
You want 90/0.95 = 94.7g ASA in order to produce 90 g at 95% yield.
mols ASA = 94.7/molar mass ASA
mols SA = mols ASA since the rxn is 1:1.
g SA = mols SA x molar mass SA.