1. The mass density of liquid argon at T = 143 K is Pm = 0.98 x 10³ kg/m³. Assume that the argon atoms interact via a Lennard-Jones potential with = 3.4 x 10-¹⁰m and ε = 1.66 × 10-2¹J. Determine the molar internal energy of liquid argon.

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