Calculate the mass of 1 molecule of carbon dioxide.

1. Molecular mass of carbon dioxide = 44g
2. Therefore , the mass of 1 mol of ${\mathrm{CO}}_2$ is 44g. As per Avogadro's rule, 1 mol of substance has $6.022\times {10}^{23}$ molecules.
3. Therefore mass of $6.022\times {10}^{23}$ molecules of ${\mathrm{CO}}_2$ is 44g.
4. Hence, the mass of 1 molecule of ${\mathrm{CO}}_2$ is =$\frac{44}{6.022\times {10}^{23}}=7.306\times {10}^{-23}g$