CHP 342 SEMESTER EXAMINATION anol(1)/me for the activ in yo Blowing An 16.5915 2023/24 c) In a laboratory 10 litres of methanol- water solution containing 30 mole% of methanol and 70 mole% of water is to be prepared. Estimate the amount (cm³) of water and methanol to be mixed to form 10 litre solution at 25 °C. For methanol/water solution at 25 °C, partial molar volume for 30 mol% methanol, V₁ = 38.632 cm³/mol, and 70 mol% water, V₂ = 17.765 cm³/mol. And molar volume of pure methanol V₁ = 40.727 cm³/mol and water V2 = 18.068 cm³/mol. × Question Three [5½ marks] For a binary system ethanol/toluene, activity coefficients are given by Wilson equation and saturation pressures are given by the Antoine equation. At 60 °C, Wilson equation parameters are: A12 = 0.1736, A21 0.1736, A21 = 0.3996, and from Antoine equation: Psat = 46.90 kPa, Psat = 18.528 kPa. Using Modified Raoult's law: a) Calculate Dew point pressure (DEWP) at T = 60 °C and y₁ = 0.3. b) Show that an azeotrope exists at 60 °C. [7 marks] [5 marks] c) Show that the azeotropic composition is, xaz = 0.3524. Estimate the azeotropic pressure at 60 °C. X Question Four A [5% marks] 2 3 a) The 3-component liquid system 1-chlorobutane/benzene/chlorobenzene conforms closely to Raoult's law. The vapor pressure of the pure species are given by the Antoine equations: 2,826.26 Topsat - Ar Bi set-A-C = P+C In Psat = 13.9600 – - In Psat = 13.8858 - In Psat = 13.9926 - T +224.10 2,788.51 T + 220.79 3,295.12 T + 217.55 where T(°C) and P(kPa). A liquid feed with a composition of z₁ = 0.20, z₂ = 0.30 and z3 = 0.50, is evaporated in a flash chamber at 125°C and 175 kPa. (i) 253.15 338-15 Z3 Show that the system after evaporation is in a 2-phase region. Page 3 of 5 1000m³ L VA Whing Antoine given Wilson equ. AR = V₂ stabiliz