If 4.05 x 10²³ molecules of a substance have a mass of 86.2 g, what is the molar mass of the substance?

Name: If 4.05 x 10 23 molecules of a substance have a mass of 86.2 g, what is the molar mass of the substance?
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Quizplus · Accepted Answer

The molar mass of a substance is the mass of one mole of that substance. One mole of a substance contains 6.022 x 10^23 molecules. Therefore, the molar mass of the substance is:86.2 g / (4.05 x 10^23 molecules) x (6.022 x 10^23 molecules/mol) = 128 g/mol

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