(a) For liquids at 1 atm, the attractive intermolecular forces make the main contribution...

(a) For liquids at 1 atm, the attractive intermolecular forces make the main contribution to Uintermol. Use the van der Waals expression in Prob. 4.22b and the van der Waals a value of 1.34 × 106 cm6 atm mol−2 for Ar to show that for liquid or gaseous Ar,

(b) Calculate the translational and intermolecular energies in liquid and in gaseous Ar at 1 atm and 87.3 K (the normal boiling point). The liquid’s density is 1.38 g/cm3 at 87 K. (c) Estimate ∆Um for the vaporization of Ar at its normal boiling point and compare the result with the experimental value 5.8 kJ/mol.