Calculate the value of mean free path ( $\lambda$ ) for oxygen molecules at temperature $27^{\circ} \mathrm{C}$ and pressure $1.01 \times 10^5 \mathrm{~Pa}$. Assume the molecular diameter 0.3 nm and the gas is ideal.
$$
\left(\mathrm{k}=1.38 \times 10^{-23} \mathrm{JK}^{-1}\right)
$$
