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12. 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 10* 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 105 m²/s. a) Calculate the flux of NH3 in kg mol/s.m?. 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?

12. 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 10* 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 105 m²/s. a) Calculate the flux of NH3 in kg mol/s.m?. 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?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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12. 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 10* 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 10 Pa and 298 K is2.30 x 105 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?
Transcribed Image Text:12. 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 10* 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 10 Pa and 298 K is2.30 x 105 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?
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