Differentiate between:
$(i)$ Molar mass and Avogadro's constant.
$(ii)$ Molecular mass and formula unit mass.

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$(i)$ Molar mass Avogadro's constant
It is the mass of one mole of a substance expressed in grams $(g/mol)$. It is the number of particles (atoms,molecules,or ions) present in one mole of a substance,equal to $6.022 \times 10^{23} \text{ mol}^{-1}$.
$(ii)$ Molecular mass Formula unit mass
It is the sum of the atomic masses of all atoms present in a molecule of a covalent compound. It is the sum of the atomic masses of all atoms in a formula unit of an ionic compound.

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