Answer
$130.44\ g$
Work Step by Step
Molecular weights (g/mol):
Aspirin: $180.16$
Salicylic acid: $138.12$
Acetic anhydride: $102.09$
With equal masses, the limiting reactant is Salicylic acid (higher molecular weight means smaller number of moles)
Number of moles of salicylic acid reacted:
$100\ g\div 138.12\ g/mol=0.724\ mol$
Mass of Aspirin formed:
$0.724\ mol\times 180.16=130.44\ g$
