Answered: CO2 is diffusing through N2 at…

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

Problem 1.1P

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Question

CO2 is diffusing through N2 at atmospheric pressure and 25C. The mole
fraction of CO2 at point A is 0.2 and is 0.02 at a point B which is 3m away from A in the
direction of diffusion. Diffusivity is 0.144 cm2/s. The gas phase as a whole (N2 + CO2) is
stationary. Considering this system, answer the following – (a) write down the equation
for the total molar flux of CO2 and sketch the expected molar concentration profile; (b)
calculate the total molar flux of CO2 in SI units; (c) calculate the net mass flux in Kg/m2.h;
(d) calculate the velocity of a moving reference plane such that the net mass flux is zero
relative to this plane.

Expert Solution

Step 1

As per our guidelines, we are supposed to answer only three subparts, please send the other part as a separate question

Solution :

Given that

CO₂ is diffusing through N₂ at atmospheric pressure and 25^oC.

$y_{C O 2, A} = 0.2, y_{C O 2, B} = 0.02, P^{T} = t o t a l p r e s s u r e = 1 a t m = 10^{5} P a; T = 25^{o} C = 298 K L = d i s \tan c e b e t w e e n A & B = 3 m G a s C O_{2} i s d i f f u \sin g t h r o u g h s ta g n a n t g a s N_{2}$