One mole of helium and one mole of neon are taken in a vessel. Which of the following statements are — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Helium ($M=4$) is lighter than neon ($M=20$). Average speed $v \propto 1/\sqrt{M}$, so He has a greater average speed. Consequently, He molecules strike the wall more frequently. Since they have equal moles in the same volume and temperature, their partial pressures are equal. The average momentum change per collision is proportional to $m v \propto m (1/\sqrt{m}) = \sqrt{m}$. Thus, heavier Ne molecules apply more average force per collision. Therefore, correct answer is A,B,C.