Question

define molecular mass of a substance​

Answer 1

Explanation:

The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively. For example, the molecular mass of water, which has two atoms of hydrogen and one atom of oxygen, is 18 (i.e., 2 + 16).

Answer 2

Explanation:

the molecular mass of substance is its relative mass of its molecule compared with the mass of carbon 12 atom taken as 12 units

it is measured in Dalton

molecular mass is dimensional quantity.