What is the mass, in grams, of 9.16×10^24 molecules of methanol (ch3oh)?

The mass in grams is 487.5 for methanol.

Explanation:

We must calcuate the grams of a compound through the molar mass of it.

Molar mass of methanol: 32.04 g/mol

We know that 1 mol has NA molecules and they weigh 32.04 g so, this is the rule of three we must make:

6.02x10²³ molecules 32.04 g

9.16x10²⁴ molecules (9.16x10²⁴ . 32.04) / 6.02x10²³  = 487.5 g

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