What is the mass, in grams, of 9.21×1024 molecules of methanol

490.02g

Explanation:

molecules of methanol

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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