calculate the weight of aspirin in mg per tablet using the following equations:

weight of aspirin = MnaoHXvnaoHXmolar mass of aspirin

No. The concentration of the NaOH is not 100 cm3. cm3 is a volume. concn is in mols/L. Also I don't believe the concentration is 100. It may be 0.100 mols/L or something like that.

A separate question I have. You state it is aspirin 75 mg in an 81 mg tablet. If you are to determine aspirin in mg/tablet, isn't that 75 mg/tablet? Here is your response just above.

weight of aspirin = 75mg and 81mg tablet
molar mass of aspirin = 180gmol
that's the value given

Didn't you read my response to this question when you posted it earlier?

I'm so sorry, I mistakenly logout without pressing the notification button. pls have mercy

You must post some numbers or you can't calculate anything.

weight of aspirin = 75mg and 81mg tablet

molar mass of aspirin = 180gmol
that's the value given

The problem tells you "using the following equations:

weight of aspirin = MnaoHXvnaoHXmolar mass of aspirim and you haven't given the molarity of the NaOH and you haven't given the volume of the NaOH. I suspect this is an experiment and you titrated the acidity of the aspirin tablet with NaOH. So when you did this in the lab you obtained the volume of the NaOH and you probably were provided with the concentration of the NaOH.

You are right.

The volume of the NaOH = 10.33cm3
concentration of the NaOH = 100cm3