Problem 4. A mixture of 50mol% Methanol (1) and 50mol% water (2) at 25C and 101.325kPa pressure are fed into a flash tank at 80C and the same pressure. A mixture of vapor and liquid forms. For the following calculations, the Wilson parameters are provided below (V in cm3/mol and aij are in cal/mol): 4a. 20 pts. Determine the composition of the vapor phase, given a liquid phase concentration x1 of 0.26 at the given pressure, and the fraction of vapor and liquid that exit the flash tank. 4b. 15 pts. Does this system have an azeotrope? Justify your answer. 4c. 10 pts. What is the Henry Coefficient for Methanol in this system at 80C and 1atm ? 4d. 10 pts. What is(are) the approximate value(s) of the Margules Parameter(s) for this system? 4e. 10 pts. Calculate the value for Gex/RT at 101.325kPa