Question

Ammonia gas is diffusing through N2 under steady-state conditions with N2 nondiffusing since its insoluble in one boundary. The total pressure is 1.013 x 104 Pa and the temperature is 298 k. The partial pressure of NH3 at one point is 1.333 Pa and at the other point 20 mm away it is 6.666 x 103 Pa. The DAB for the mixture at 1.013 x 105 Pa and 298 K is2.30 x 10-5 m2/s. a) Calculate the flux of NH3 in kg mol/s.m2. b) Do the same as (a) but assume that N2 also diffuses; i.e., both boundaries are permeable to both gases and the flux is equimolar counterdiffusion. In which case is the flux greater?

Answer 1