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Question 1: (20mark) A glucose-acetate membrane with an area of 4.0 x 103 m² is used at 25°C to determine the permeability constant for reverse osmosis of feed salt solution containing 12.0 kg NaCl/m³ (density: 1005.5 kg/m³). The product solution has a concentration of 0.468 kg NaCl/m³ (density: 997.3 kg/m³). The measured product flow rate is 3.84 x 10 m³/s and the pressure difference used is 56.0 atm. Calculate the permeability constants and the solute rejection R. Table 1: Osmotic pressure of various aqueous solutions at 25°C Sodium Chloride Solutions Sea Salt Solutions Wt % Salts Osmotic Pressure (atm) gmol NaCl Density kg H₂0 (kg/m³) 0 0.01 0.1 0.5 1.00 2.00 997 997.4 1001.1 1017.2 1036.2 1072.3 Osmotic Pressure (atm) 0 0.47 4.56 22.55 45.80 96.2 0 1.00 3.45 7.50 10.00 0 7.10 25.02 58.43 82.12 Sucrose Solutions Solute Mol Osmotic Fraction x pressure 10³ (atm) 0 0 2.48 7.48 15.31 26.33 1.798 5.375 10.69 17.70