Question

If 16 g of oxygen contain 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.

Answer 1

1 mole of oxygen = $6.022\times {10}^{23}$ atoms of oxygen

Mass of 1 mole of oxygen atom = 16 g

$$\begin{gathered} \mathrm{Mass}\mathrm{of}\mathrm{one}\mathrm{atom}\mathrm{of}\mathrm{oxygen}=\frac{\mathrm{Mass}\mathrm{of}\mathrm{one}\mathrm{mole}\mathrm{of}\mathrm{oxygen}\mathrm{atom}}{\mathrm{Number}\mathrm{of}\mathrm{atoms}\mathrm{in}\mathrm{one}\mathrm{mole}} \\ \mathrm{Mass}\mathrm{of}\mathrm{one}\mathrm{atom}\mathrm{of}\mathrm{oxygen}=\frac{16}{6.022\times {10}^{23}}\mathrm{g}=2.6569\times {10}^{-23}\mathrm{g} \end{gathered}$$