The relative molecular mass of nitrogen molecule is:

• The relative molecular mass of nitrogen is $28.01\mathit{ g}$.
   
• Relative atomic mass is calculated about the mass of one atom of $C-12.$
• The relative molecular mass of nitrogen is determined by the combined mass of its atoms in a molecule. Each nitrogen atom has an atomic mass of 14.006 g. Since a nitrogen molecule $\left(N_{\mathit{2}}\right)$ consists of two nitrogen atoms, we can calculate the mass of the molecule by multiplying the atomic mass of one nitrogen atom by 2:

           $2 \times 14.006 = 28.012 g.$

• Therefore, the relative molecular mass of nitrogen molecule is $28.012 \mathrm{g}$.