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Molecular mass is defined as the sum of atomic masses of atoms that are all present in the molecule.

The chemical composition of the substance is given by the chemical formula.

The molecular name gives the composition of chemical elements present in the molecule.

The molecule consists of nitrogen atoms and anoxygen atom.

The Molecular formula is given as${\mathbf{N}}_{\mathbf{2}}\mathbf{O}$ .

The compound is nitrous oxide or dinitrogen monoxide.

Molecular Mass is given by$\mathbf{2}\mathbf{×}\mathbf{atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{N}\mathbf{+}\mathbf{atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{O}$

Molecular mass$\mathbf{=}\left(2×14\right)\mathbf{+}\left(1×16\right)$

Molecular Mass$\mathbf{=}\mathbf{44}\mathbf{.}\mathbf{02}\mathbf{}\mathbf{amu}$.

The molecule consists of carbon atoms and each carbon is attached tohydrogen atoms.

The molecular formula is given as ${\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{6}}$.

The compound is ethane.

Molecular mass is given by$\mathbf{2}\mathbf{×}\mathbf{atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{C}\mathbf{+}\mathbf{6}\mathbf{×}\mathbf{atomic}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{H}$

Molecular mass$\mathbf{=}\left(2×12.00\right)\mathbf{+}\left(6×1.01\right)$

Molecular Mass.$\mathbf{=}\mathbf{30}\mathbf{.}\mathbf{06}\mathbf{}\mathbf{amu}$