Calculate the mass of $1$ atom of nitrogen.

Molar mass of NItrogen $=14g/mole$

i.e mass of $1$ mole of N$=14g$

$1$ mole contains $6.022\times {10}^{23}atoms$

$\therefore$ mass of $6.022\times {10}^{23}$ atoms of $N=14g$

Mass of $1$ atom of $N=\frac{14g}{6.022\times {10}^{23}atoms}$

Mass of $1$ atom of $N$ is $2.32\times {10}^{-23}g$