Q1: Find a paper from 2003 about difluoromethane and propane by Coquelet and others that contains the Pxy vapor liquid equilibria data they measured and give a full citation to that data. Q2: Extract the experimental Pxy data from Table 5 at 278.10K and use that to compute gammas for both substances at all compositions. This will be the base data we use for this entire homework. Answer the following questions as you do this part of the individual HW: a) There is an azeotrope at this temperature. What composition, temperature \& pressure does it occur at? b) If you use just the data for R-32 (difluoromethane) and equation 11.6 at the azeotrope, what is the value of A12 and what are the units for the constant? c) If you use just the data for propane and equation 11.6 at the azeotrope, what is the value of A12 and what are the units on the constant? You can renort vour constants here: Q3: We have two A12 constants at this point; let's see how they do in predicting the same VLE data set at the same temperature. Using the same x-values as the experimental data in Table 5, predict the following using each of the A12 constants in problem 2: gR32,gpropane,Ptotal and yR32 at 278.10K. Plot each prediction as dashed lines on a new plot which also includes the Pxy experimental data as points. By eyeball, which A12 constant "does the best"? With the objective function, which constant does the best? Q4: Optimize the objective function by changing the A12 constant. Report the value of your objective function and the value of the constant