Flask with greater mean free path for the molecules (r_H2 : r_CH4 : r_O2 = 1 : 2 : 2) — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Mean free path λ ∝ V / (d^2 × N). Since mass is constant, N ∝ 1/M. Thus, λ ∝ M / d^2. For $H_2$: M/d^2 = 2 / 1^2 = 2. For $CH_4$: M/d^2 = 16 / 2^2 = 4. For $O_2$: M/d^2 = 32 / 2^2 = 8. Hence, Flask C (containing $O_2$) has the largest mean free path.