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

Question

Quizplus · Accepted Answer

The given number of molecules (4.05 × 10^23) is close to Avogadro's number (6.022 × 10^23), which represents one mole of a substance. Since 86.2 g corresponds to a fraction of a mole (less than one mole), the molar mass, which is the mass of one mole, must be greater than 86.2 g. Among the options, only 128 g/mol is greater and a reasonable estimate for the molar mass of the substance.

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