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Question 2: [Total 15 marks) A feed solution at 25C contains 3500mg NaCIL (p = 999.5 kg/m?). The permeability constant Aw = 3.50x104 kg solvent/s.m.atm and As = 2.50x10m/s. Using a AP of 35.5 atm, calculate: a) The solvent flux [10 marks] b) The solute rejection [2 marks] c) Permeate concentration in kg NaCl/m [2 marks] d) The salt flux [1 mark] Useful data and formulae: Relative Molecular Masses: Na = 23.00 C1 = 35.45 Table 1: Osmotic pressures of Various Sodium Chloride Solutions at 25C g mol NaCl / kg H2O Density (kg/m) Osmotic Pressure (atm) 0 997 0 0.01 997.4 0.47 0.10 1001.1 4.56 0.50 1017.2 22.55 1.00 1036.2 45.80 Nw = Pw (AP - AT) = A(AP - Art) Ns = DsRs (C1 - cy) = As(C7 - cz) Lm B(AP-AT) R= B = 1+B(AP-AT) AW Astwa Ng NwC2 Cw2 C1-C2 R= C1 Page 2 of 3