Question

what is meant by atomic mass and molecular mass​

Answer 1

The atomic mass unit (u) is a unit that describes the masses of individual atoms and molecules. The atomic mass is the weighted average of the masses of all isotopes of an element. The molecular mass is the sum of the masses of the atoms in a molecule.

Answer 2

Answer:

atomic mass of an atom tells that how many times it is heavier than 1 atom of hydrogen or ½of carbon¹² atom or 1/35.5 of chlorine atom

molecular mass is defined as the mass of the molecule which tells how many times it is heavier than one atom of hydrogen or ½ of carbon¹² atoms or 1/35.5 of chlorine atoms.