Pxy and Txy Diagrams for Vapor-Liquid Equilibrium (VLE)
The vapor-liquid equilibrium (VLE) behavior of a mixture of benzene () and toluene () is explored in and diagrams. Click the diagram to move the black point that represents the two variables: mole fraction of benzene and temperature or pressure. This system is modeled by Raoult's law, because ideal solution behavior is expected in the liquid phase for such similar molecules. The corresponding bar chart displays the relative amounts of liquid (blue) and vapor (green) that are in equilibrium and the mole fraction of benzene in each phase for liquid phase, for vapor phase); the relative amounts are calculated using the lever rule. The blue line represents the liquid phase boundary (bubble point) and the green line represents the vapor phase boundary (dew point). You can vary the temperature for the diagram and the pressure for the diagram.