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 a substance = 4.65 × 10^-23

We know that the mass of a molecule of a substance is equal to the mass of 1 mole of that substance.

1 mole of a substance consists of 6.022 × 10²³ molecules; therefore, the mass of a molecule of a substance is equal to the mass of 6.022 × 10²³ molecules.

Therefore, to calculate the molecular mass of the substance, we need to calculate the mass of 6.022 × 10²³ molecules of that substance.

Mass of 1 molecule of the substance = 4.65 × 10^-23

Mass of 6.022 × 10²³ molecules of the substance

= 6.022 × 10²³ × 4.65 × 10^-23

= 28g

Hence, the molecular mass of the substance is 28 u.