What is the ending pressure of the Helium gas?

[Kiara]

If I know that liquid helium at 4.2 K (boiling point) occupies 0.01065 L, then how do I calculate the pressure exerted on the walls of its containers if the helium evaporates and warms up to 30 K?

 

[K^2]

At 30K, Helium is supercritical (cannot be liquid in conventional sense) and follows ideal gas law quite well. Density of liquid helium at boiling point is 0.125g/cm³. That should be all you need to know to solve this problem.