The internuclear distance between two closest ar atoms in solid argon is about 3.8 a. the polarizability of argon is 1.66e-30 m3, and the first ionization is 1521kj/mol. estimate the boiling point of argon [hint: calculate the potential energy due to dispersion interaction for solid argon, and equate this quantity to the average kinetic energy of 1mole of argon gas, which is (3/2)rt].

i'm confused about where to use the first inonization energy?