Phase-Transitions and Clausius-Clapeyron Relationship: Using the P-T phase diagram for water below, select 10 approximate (PT) data points from the liquid-vapor phase transition line and use Microsoft Excel to plot these data on a natural log plot. In this plot, P is the pressure and T is in Kelvins (K). Use the slope of this plot and the Clausius-Clapeyron equation to determine the enthalpy of vaporization of water.