Question

a) Define atomic mass unit.
b) Distinguish between molecular mass and molar mass.
c) Give an example of (i) diatomic, (ii) triatomic molecule of compounds.

Answer 1

(a) Atomic mass unit is the unit of mass used to express atomic and molecular weights, equal to 1/12th of the mass of an atom of carbon-12.

(b) Molecular mass refers to the mass of a molecule, while molar mass refers to the mass of a mole of a substance.

(c) Nitrogen, $N_2$, is a diatomic compound. Ozone, $O_3$, is a triatomic compound.