Repeat Example 8.15 using the Peng–Robinson equation of state. Compare your answer to the reported measured value of P = 69.1 bar and y1 = 0.95.

Example 8.15

Using the equation of state method, determine the equilibrium composition in the vapor phase and the system pressure of a mixture of methane (1) and n-pentane (2) with a liquid mole fraction of x1 = 0.3 at 37.78°C. Use the van der Waals equation of state to determine fugacity for both vapor and liquid phases.