The surface of a 2.5 mm thick ammonia (A) (NH3) – water (B) (H2O) solution at 298 K is in contact with an organic liquid. At the interface (the surface in contact with the organic liquid and water), the equilibrium concentration of ammonia in water is kept constant at 3% by weight (aqueous solution density at this first point, 992.5 kg/m3). 2.5 mm away, at the other border of the film, the concentration of ammonia in water is 12% by weight (the density of the aqueous solution at this second point is 962.3 kg/m3). The water and organic phase are insoluble in each other. (MA = 17.03 kg/kgmol, MB = 18 kg/kgmol) (Assume the ammonia-water solution is 100 kg.) (a) Calculate the diffusibility of ammonia in water using the Wilke-Chang correlation. (Water viscosity at 298 K, B = 0.8937 x 10-3 Pa. s) (b) Calculate the steady state NA flux.