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Molar mass

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Acetylsalicylic acid acid is the active ingredient in aspirin. It took 35.17 mL of 0.5065 M sodium hydroxide to react completely with 3.210 g of acetysalicylic acid. Acetylsalicylic acid has only one acidic hydrogen. What is the molar mass of acetylsalicylic acid? I know the answer but I need help to set up the problem and to know why. I think I need to use the formula for molar mass but it is not solving correctly.

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Solution Preview

The first equation allows us to solve for the moles of acetysalicylic acid:

Moles of Acetylsalicylic acid = Moles of base
and ...

Solution Summary

The solution shows, step by step, how to obtain the molar mass of Acetylsalicylic acid.