The average kinetic energy per molecule of an ideal gas at $300 \mathrm{K}$ is:

If the RMS velocity of one mole of helium gas having molar mass $\mathrm{M}$ is ${\mathrm{u}}_{\mathrm{rms}}$, what is the correct expression for ${\mathrm{u}}_{\mathrm{rms}}$?

(Average kinetic energy is $\mathrm{KE}$)

The pressure of $2$ moles of $\mathrm{HF}$ gas in a $5 \mathrm{litres}$ flask at a certain temperature is $9.33 \mathrm{atm}$. The temperature of the gas is:

(Given: $\mathrm{a}=4.17, \mathrm{b}=0.03711$)

Which one of the following is most likely to be correct regarding the graph given above?