What is the mass of one atom of Oxygen?

The gram atomic mass of oxygen is 16g.  It means one mol of oxygen (Or )$6.022\times {10}^{23}$atoms of oxygen have 16 g of mass.

Hence, the mass of one atom of oxygen is

      $\frac{16\text{\hspace{0.17em}g}}{6.022\times {10}^{23}\text{\hspace{0.17em}atoms\hspace{0.17em}of 'O'}}\times 1\text{\hspace{0.17em}atom\hspace{0.17em}of 'O'\hspace{0.17em}=}\frac{16\text{\hspace{0.17em}g}}{6.022\times {10}^{23}}$