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I am assuming that the question is: what is the mass, in grams, of 9.93x1024 molecules of methanol (CH3OH).

For any question concerning mass and a chemical, we must find the molecular mass by adding the atomic masses from the periodic table:

C=12.0g

4H= 4 x 1.01 = 4.04g

O=16.0g

Total: 32.0g/mole

Now, how many moles is 9.93x1024 molecules, if one mole is 6.02x1023? (9.93x1024 ) / (6.02x1023) = 15.5 moles.

So, 15.5 moles x 32.0g/mole = 496g.

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Q: What is the mass in grams of 9.93x1024 molecules of methanol CH3OH?
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