You are a student doing a project where you are evaluating process options in the separation of a propane (1) + n-butane (2) system at 323.15 K. There are choices of equations of state that you can use and you need to make a selection. Prior to this, you decide to predict the phase behavior yourself using two of the choices: the van der Waals equation of state and the Peng-Robinson equation of state. Provide the Pxy diagram for this system using both models.