Final answer:
The exact mass of ASA in aspirin cannot be determined without the molarity or the information from the experimental setup.
Step-by-step explanation:
The question asks about the exact mass of Acetylsalicylic acid (ASA) in aspirin. To determine the mass of ASA in 2.50 g of aspirin, we need to know the molar mass of ASA and the number of moles present in 2.50 g. The molar mass of ASA is 180.2 g/mol. To find the number of moles, we divide the mass of aspirin by its molar mass. In this case, since the molarity and the given experimental setup are not provided, the exact mass of ASA in aspirin cannot be determined.