A liquid mixture containing 18.0 wt% water, 37.0 wt% methanol, 17.0 wt% ethanol, and the balance propanol is fed at 250.0 lbm/min into an evaporator operating at steady state. Two streams exit the evaporator: a vapor stream and a liquid stream, both of which contain all four components. The mass fraction of methanol in the vapor stream is 0.440 , the mass fraction of propanol in the liquid stream is 0.410 , and 60.0 % of the ethanol in the feed stream ends up in the vapor stream. The ratio of the total mass flow rate of the vapor exit stream to the total mass flow rate of the liquid exit stream is 1.21. Draw and label a flow sheet for the process. Label the total flow rate of each stream with a unique symbol. Label the mole fractions in each stream with unique symbols. You should have a total of 15 unique labels (3 flow rates and 12 mole fractions.) Degree-of-Freedom Analysis Total number of process variables: 15 Number of variables directly specified in problem statement: 3 Number of material balances: Number of constraints: Number of other constraints in the problem statement: Degrees of Freedom: