The vapor-liquid equilibrium (VLE) behavior of a benzene (C₆H₆)/toluene (C₇H₈) mixture is demonstrated in P-x-y and T-x-y diagrams. The blue line represents the liquid-phase boundary (bubble point) and the green line represents the vapor-phase boundary line (dew point). Drag the black dot on either diagram and the bar chart shows the amounts of liquid (blue) and vapor (green); the system contains a total of 1 mol. The mole fractions of benzene in each phase (x_B for liquid phase, y_B for vapor phase) are also shown in the bar graph. Use sliders to vary the temperature for the P-x-y diagram and the pressure for the T-x-y diagram. This system is modeled by Raoult’s law because a benzene/toluene liquid phase is expected to be ideal.