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C9H8O4 has a molar mass of 180 g/mol
convert 100.0 mg to grams and you get 0.1 g
divide the 2 and you end up with mols = 1800 mols
multiply by avogradros number (6.022e23) and you end up with molecules.
1.08396e27 molecules of aspirin in the tablet
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