Question

Assuming ideal gas behaviour and only biomolecular collisions to be occuring which of the following gases will have longest mean free path under identical concentrations.

• A. $H_2$
• B. $N_2$
• C. $C{l}_2$
• D. $F_2$

Answer 1

The correct option is A $H_2$

(i) Because of its random high speed motion, a molecule in a gas at atmospheric pressure makes many collisions per second with other molecules.

(ii) The mean free path $\lambda$ is the average distance traveled between collision.

(iii) $H_2$ has mean free path $\lambda$ as $11.5\times {10}^{-5}$ which is more than other given gases.