Assignment problem 3.2: An ethanol (A)-water (B) solution in the form of a stagnant film 2.0 mm thick at 293 K is in contact at one surface with an organic solvent in which ethanol is soluble and water is insoluble. Hence NB = 0. At point 1, the concentration of ethanol is 16.8 wt% and the solution density is 972.8 kg/m³. At point 2, the concentration of ethanol is 6.8 wt% and density is 988.1 kg/m³.The diffusivity of ethanol is 0.740 × 10-9 m²/s. Calculate the steady state flux NA.