Question

Define atomic mass and molecular mass​

Answer 1

The molecular mass of a substance is the number of times the molecule of the substance is heavier than one-twelth the mass of an atom of carbon -12. Or, the molecular mass is equal to the sum of its atomic masses of all the atoms present in one molecule of a substance. For eg: Water (H2O) Atomic mass of H= 1 unit.

Answer 2

Answer:

Atomic mass is the mass of  an atom of a chemical element expressed in atomic mass units.

Molecular mass is the mass of  a given molecule , it is measured in daltons .