100 mol/hr of an ethanol/HO mixture containing 10 mol% ethanol is to be produced as the liquid outlet stream from an isothermal (T-78.15C) flash unit. The feed stream is 30 mol% ethanol. At 78.15C the liquid mixture of ethanol(1)/water(2) is adequately described by the following van Laar equations for the activity coefficients: Az1Xz Iny = A12 A12x1 + A1X/ A21x24 In y2 = A21 2 A12X1 A12X1 + A21x2/ A12 = 1.6798 A21 = 0.9227 Assume that the vapor phase behaves as an ideal gas and that the fugacities of pure ethanol and water are independent of pressure (i.e., that it is appropriate to use modified Raoult's law). At 78.15C the saturation pressure of pure ethanol is 755 mm Hg and the saturation pressure of pure water is 329 mm Hg. Determine: (i) (ii) the outlet pressure at which the flash must be operated. the composition of the vapor stream. the flow rates of the feed and vapor streams.