Problem solved. 1. The problem statement, all variables and given/known data The boiling point of a certain liquid is 95OC at the top of a mountain and 105OC at the bottom. Its latent heat is 1000 cal/mole. Calculate the height of mountain. It's Q4 of chapter 15 in Statistical Mechanics by S.K. Ma 2. Relevant equations it should be the Clausius-Clapeyron Equation 3. The attempt at a solution I tried to use the canonical partition function to derive the pressure in terms of height, and then plug it into the Clausius-Clapeyron Equation, but it is not successful.