The measured value of the latent heat of vaporization of argon (at 1 atm) is 6.43 kJ/mol. Use this to estimate the binding energy. (Given answer: 0.059 eV) [Boiling point @ 1atm: 87.3K] My initial approach was that since 6,430 joules worth of bonds had to be broken for a mole of Argon to vaporize, then to obtain the binding energy I could just divide the latent heat by the number of molecules in a mole. This gave me an incorrect answer of .067 eV and is clearly an oversimplified approach. Any thoughts? Edit: Never mind I got it. I forgot to subtract the work that goes into the expansion of the gas, and that it's the change in internal energy that's at question.