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19.1-3. Diffusion of A Through Stagnant B and Effect of a Type of Boundary on Flux. Ammonia gas is diffusing through N2 under steady-state conditions with N₂ nondiffusing since it is insoluble in one boundary. The total pressure is 1.013 × 105 Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 × 104 Pa, and at the other point 20 mm away it is 6.666 × 10³ Pa. The Dâŋ for the mixture at 1.013 × 105 Pa and 298 K is 2.30 × 10-5m²/s. . a. Calculate the flux of NH3 in kg mol/s · m². b. Do the same as (a) but assume that N2 also diffuses; that is, both boundaries are permeable to both gases and the flux is equimolar counterdiffusion. In which case is the flux greater? Ans. (a) NA = 3.44 × 10-6 kg mol/s · m²

19.1-3. Diffusion of A Through Stagnant B and Effect of a Type of Boundary on Flux. Ammonia gas is diffusing through N2 under steady-state conditions with N₂ nondiffusing since it is insoluble in one boundary. The total pressure is 1.013 × 105 Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 × 104 Pa, and at the other point 20 mm away it is 6.666 × 10³ Pa. The Dâŋ for the mixture at 1.013 × 105 Pa and 298 K is 2.30 × 10-5m²/s. . a. Calculate the flux of NH3 in kg mol/s · m². b. Do the same as (a) but assume that N2 also diffuses; that is, both boundaries are permeable to both gases and the flux is equimolar counterdiffusion. In which case is the flux greater? Ans. (a) NA = 3.44 × 10-6 kg mol/s · m²

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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19.1-3. Diffusion of A Through Stagnant B and Effect of a Type of Boundary on Flux. Ammonia gas is diffusing through N2 under steady-state conditions with N₂ nondiffusing since it is insoluble in one boundary. The total pressure is 1.013 × 105 Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 × 104 Pa, and at the other point 20 mm away it is 6.666 × 10³ Pa. The Dâŋ for the mixture at 1.013 × 105 Pa and 298 K is 2.30 × 10-5m²/s. . a. Calculate the flux of NH3 in kg mol/s · m². b. Do the same as (a) but assume that N2 also diffuses; that is, both boundaries are permeable to both gases and the flux is equimolar counterdiffusion. In which case is the flux greater? Ans. (a) NA = 3.44 × 10-6 kg mol/s · m²
Transcribed Image Text:19.1-3. Diffusion of A Through Stagnant B and Effect of a Type of Boundary on Flux. Ammonia gas is diffusing through N2 under steady-state conditions with N₂ nondiffusing since it is insoluble in one boundary. The total pressure is 1.013 × 105 Pa and the temperature is 298 K. The partial pressure of NH3 at one point is 1.333 × 104 Pa, and at the other point 20 mm away it is 6.666 × 10³ Pa. The Dâŋ for the mixture at 1.013 × 105 Pa and 298 K is 2.30 × 10-5m²/s. . a. Calculate the flux of NH3 in kg mol/s · m². b. Do the same as (a) but assume that N2 also diffuses; that is, both boundaries are permeable to both gases and the flux is equimolar counterdiffusion. In which case is the flux greater? Ans. (a) NA = 3.44 × 10-6 kg mol/s · m²
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