## 2. (20 pts.) (a) Starting from the Clapeyron equation, derive the Clausius-Clapeyron equation. Be sure to state any approximations that you make, I u (b) On the surface of Mars, water boils at 276 K. Given that the enthalpy of vaporization of water is 40.66 kJ mol”), what is the atmospheric pressure on the surface? (At P = 1 bar, water boils at 373 K.)

EXPERT ANSWER