Hexane (1) and heptane (2) can be suitably modeled as an ideal solution and ideal vapor phase. Find the following for this binary mixture at a temperature of 90 °C: a) Total pressure of the mixture at x1 = 1. b) Total pressure of the mixture at x2 = 1. c) Total pressure of this mixture at x1 = 0.2. d) Which model did you use? Show all working. Find the relevant constants required for this problem from the Appendix of your textbook, Dahm & Visco et al.