Ethanol (A) is diffusing through air (B) under steady state condition, with air non- diffusing at temperature 313K and pressure 101.3 kPa. The partíal pressures of ethanol at two planes 5 mm apart are 8 kPa and 4 kPa. The diffusivity of ethanol in air is 1.45 x 105 m2/s. Calculate the rate of diffusion of ethanol per unit area of planes. Derive a relation between the mole fraction of ethanol and the distance along the direction of diffusion. Use the relation to find the mole fraction at the centre of the diffusion path
Ethanol (A) is diffusing through air (B) under steady state condition, with air non- diffusing at temperature 313K and pressure 101.3 kPa. The partíal pressures of ethanol at two planes 5 mm apart are 8 kPa and 4 kPa. The diffusivity of ethanol in air is 1.45 x 105 m2/s. Calculate the rate of diffusion of ethanol per unit area of planes. Derive a relation between the mole fraction of ethanol and the distance along the direction of diffusion. Use the relation to find the mole fraction at the centre of the diffusion path
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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Transcribed Image Text:Ethanol (A) is diffusing through air (B) under steady state condition, with air non-
diffusing at temperature 313K and pressure 101.3 kPa. The partial pressures of ethanol
at two planes 5 mm apart are 8 kPa and 4 kPa. The diffusivity of ethanol in air is
1.45 x 105 m²/s. Calculate the rate of diffusion of ethanol per unit area of planes. Derive
a relation between the mole fraction of ethanol and the distance along the direction of
diffusion. Use the relation to find the mole fraction at the centre of the diffusion path.
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