A stagnant film of ethanol (A)-water (B) solution with a thickness of 3 mm is at 273K. The film is in contact at one surface with an organic solvent in which ethanol is soluble but water is insoluble (NB=0). The concentration of ethanol at one side of the film (point1) is 15% (w/w), and the density of the solution at this point is 972.8 kg/m3. the concentration of ethanol and density of the solution at the other side (point2) are 5% (w/w) and 988.1kg/m3 , respectively. If the diffusivity of ethanol is 0.7x10-9m2/s, calculate the flux with an assumption of steady-state.