Q2 A mixture of ammonia (A) and water (B) solution is kept in a container at 278 K. The concentration of ammonia in the water at equilibrium state is 2.0 wt% (density of aqueous solution is 991.7 kg/m?) at one point, and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt% (density of aqueous solution is 961.7 kg/m). Water and ammonia are insoluble in each other. Assume total mass of solution is 100 kg. The diffusion coefficient of ammonia in water is 1.24 x 10-9 m/s. (a) Compute the flux N in kg.mol/s.m at steady state. (18 marks) (b) Predict the flux Nb and justify. (2 mark)