The molecular weight of ethylene glycol is 62.0 amu. What is the mass of one molecule of ethylene glycol?

Question

Quizplus · Accepted Answer

To find the mass of one molecule of ethylene glycol, we need to convert the molar mass to grams per mole and then to grams per molecule since 1 mole contains Avogadro's number of molecules (6.022 x 10^23).

mass of one molecule = (mass of 1 mole) / (Avogadro's number)

mass of 1 mole of ethylene glycol = 62.0 g/mol 
Avogadro's number = 6.022 x 10^23

mass of one molecule = (62.0 g/mol) / (6.022 x 10^23) 
mass of one molecule = 1.03 x 10^-22 g/molecule

Therefore, the best choice is D, 1.03 x 10^-22 g.

The Molecular Weight of Ethylene Glycol Is 62