Obtain the vapor-liquid phase envelope for the binary system n-hexane - toluene at 25C. Assume that the system can be modeled using the regular solution theory what parameters given in table 8.2. State any additional assumption in your calculations. What is the dew-point pressure for the equimolar mixture.?

You can use the van Laar form of the activity coefficients, with c₁ and c₂ given from RST by: c_1,2 = V_1,2(d₁ d₂)²