Question

The measured value of the latent heat of vaporization of helium (at 1 atm) is 84 J/mol. Use this to estimate the binding energy of the helium atoms in the liquid.

Answer 1

If 84 joules is the amount of (latent) heat needed to "disconnect", so to speak, 1 mole = Avogadro's number of (liquid) He atoms from each other, then the answer may be 84 divided by 6.023 x 10^23 joules
=1.39x10^-22 joules per He atom (small number, but a lot of them ... ?)
if I'm right ...