The mass of one molecule of a substance is 4.65 × 10-23 g. What is its molecular mass? What could this substance be?
Mass of one molecule of substance = 4.65 × 10-23 u
So, mass of 1 mole of substance = Mass of 6.022 × 1023 molecules of the substance
= 4.65 × 10-23 × 6.022 × 1023 u = 28 u
The substance is Nitrogen with molecular mass 28 u.