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You need a certain amount of rubbing alcohol in order to set up a problem. Like if you had 72.5 grams of C3H8O (rub alc) then you would have 7.27 x 10^23 atoms.

1. Find molecular mass of C3H8O = 60.094g

2. Take the amount of C3H8O given (72.5g) and using NA (advogadros number)-however its spelled- and multiply those numbers.

3. Then taking that number and divide it by the molecular mass of C3H8O (60.094g).

4. You should get an answer like this= 7.27 x 10^23 amu

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