Liquid He (consisting of just a single isotope He-4, which is a boson) undergoes a super-fluid transition at temperature T = 2.16K. At this temperature, it has a mass density of0.145g/cm³. Make an assumption that liquid helium behaves like an ideal gas and computethe critical temperature for Bose-Einstein condensation. Express your answer in Kelvins.What is the mass density of He atoms at excited states at this temperature? Express youranswer in g/cm³ units. What can be said about the chemical potential of He-4 atoms at thispoint?

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