The Fick's Law of Molecular Diffusion states that the mole of substance A being transferred per time (NA) per unit area (A) is proportional to the negative of the differential of the concentration (dCA) but inversely proportional to the differential of the distance, z, by which there is the diffusion occurs (dz). The proportionality constant being the volumetric diffusivity D,. In mathematics, dCA - Dv NA A dz NA /A is called the molar flux and is constant throughout any distance. Considering a perfect gas at 25°C, with initial pressure of 0.8 atm diffusing through one (1) meter distance, by which the exit pressure is 0.2 atm; it has a diffusivity of 0.121 cm²/s at 25°C. Calculate the molar flux of the gas in mole/s-m2.

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
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substance A being transferred per time (NA) per unit area
(A) is proportional to the negative of the differential of the
concentration (dCA) but inversely proportional to the
differential of the distance, z, by which there is the diffusion
occurs (dz). The proportionality constant being the
The Fick's Law of Molecular Diffusion states that the mole of
volumetric diffusivity Dy. In mathematics,
dCA
-Dv
NA
A
dz
NA /A is called the molar flux and is constant throughout any
distance. Considering a perfect gas at 25°C, with initial
pressure of 0.8 atm diffusing through one (1) meter
distance, by which the exit pressure is 0.2 atm; it has a
diffusivity of 0.121 cm²/s at 25°C. Calculate the molar flux of
the gas in mole/s-m2.
Transcribed Image Text:substance A being transferred per time (NA) per unit area (A) is proportional to the negative of the differential of the concentration (dCA) but inversely proportional to the differential of the distance, z, by which there is the diffusion occurs (dz). The proportionality constant being the The Fick's Law of Molecular Diffusion states that the mole of volumetric diffusivity Dy. In mathematics, dCA -Dv NA A dz NA /A is called the molar flux and is constant throughout any distance. Considering a perfect gas at 25°C, with initial pressure of 0.8 atm diffusing through one (1) meter distance, by which the exit pressure is 0.2 atm; it has a diffusivity of 0.121 cm²/s at 25°C. Calculate the molar flux of the gas in mole/s-m2.
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