First, write a balanced equation (even if you do not do it here).
Is the molar ratio 1:1?
Because you know salicylic acid is the limiting reagent, the amount(in mol's) of the salicylic acid is the maximum possible amount (in mol's) of the product (in a 1:1 reaction, is this reaction 1:1?). Therefor if you assume a 100% complete reaction, the amount of salicylic acid (in mols) = maximum possible amount of acetyl salicylic acid (in mols) [aspirin].
In short, but you really should understand why.
Calculate mols of salicylic acid, relate that with mols of aspirin; convert mols of aspirin to grams. You are done. It is just one division and one multiplication.