Question

Calculate the mass of one atom of oxygen.

Answer 1

Step 1: Atomic mass of oxygen:-

The atomic mass of oxygen is $16\mathrm{g}/\mathrm{mol}$

Step 2: Total atoms in 1 mole of oxygen:-

The total number of atoms that are present in 1 mole of oxygen is $=6.022\times {10}^{23}$

Or $6.022\times {10}^{23}$number of atoms in oxygen weighs 16g.

Step 3: Mass of 1 atom of oxygen:-

Therefore the mass of 1 atom of oxygen is

$\mathrm{Mass}\mathrm{of}\mathrm{one}\mathrm{atom}=\frac{\mathrm{Atomic}\mathrm{mass}}{\mathrm{Avogadro}\mathrm{number}}$

$\Rightarrow \frac{16}{6.022\times {10}^{23}}=2.657\times {10}^{-23}\mathrm{g}$.

Hence the mass of 1 atom of oxygen is $2.657\times {10}^{-23}\mathrm{g}$