A vessel contains 1 mol of H2 and 1 mol of He at 300 K. Which of the following are correct for this mixture?

The two gases exert equal partial pressures

The rms speed of H2 is sqrt2 times that of He

The average kinetic energy per molecule is the same for both gases

The two gases exert equal partial pressures

The rms speed of H2 is sqrt2 times that of He

The average kinetic energy per molecule is the same for both gases

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ig049

A vessel contains $1 mol$ of $H X_{2}$ and $1 mol$ of $He$ at $300 K$ . Which of the following are correct for this mixture?

Equal moles give equal mole fractions and equal partial pressures (A).

u_{rms} \propto 1/ M

4/2 = 2

(B).

\overline{K E} = \frac{3}{2} k_{B} T

is the same for all gases at one

T

(C). Masses

2 g

and

4 g

, so the He mass fraction is

4/6 = 2/3

(D). All are correct.