Unknown mystery gas (not ideal gas). Despite the initial pressure in ice water b

Question

Unknown mystery gas (not ideal gas). Despite the initial pressure in ice water bath, the mystery gas had very comparable to the theoretically predicted pressure in a dry ice-methanol mixture, but had a pressure of 0 (zero) kPa, far off the predicted mark, when submerged into a liquid nitrogen. The submersion into the liquid nitrogen caused a phase change from gas to a solid or liquid.

Phase transition temperatures:

Oxygen 90K Nitrogen 77K Carbon Dioxide 195K Helium 4K Which gases from the list could behave like the mystery gas?

Explanation / Answer

Helium 4K gases from the list could behave like the mystery gas because , helium gas particles cooled into liquid nitrogen display very little attraction for one another. This makes sense, since helium does not liquefy until cooled to 4 K. Because of this, helium gas behaves ideally when placed in liquid nitrogen henxe it act like mystery gas.

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