Suppose that copper Cu atoms Complementary Error Function erfc diffuse from the surface into a piece of aluminum Al that is 0.9 initially pure. If it takes 7 hours 0.8 to achieve a concentration of 0.7 0.20wt% Cu at a depth of 0.6 0.2mm into the Al when the 0.5 diffusion process is carried out at 600°C (D is 5.3x10-13 m?/s), 0.4 what is the concentration at 0.3 the surface of the Cu? 0.2 Assume that the 'semi-infinite 0.1 approximation' is valid for this process. (A plot of the erfc 0.5 1.5 function is provided at right.) 2. 1. erfc(z)
Suppose that copper Cu atoms Complementary Error Function erfc diffuse from the surface into a piece of aluminum Al that is 0.9 initially pure. If it takes 7 hours 0.8 to achieve a concentration of 0.7 0.20wt% Cu at a depth of 0.6 0.2mm into the Al when the 0.5 diffusion process is carried out at 600°C (D is 5.3x10-13 m?/s), 0.4 what is the concentration at 0.3 the surface of the Cu? 0.2 Assume that the 'semi-infinite 0.1 approximation' is valid for this process. (A plot of the erfc 0.5 1.5 function is provided at right.) 2. 1. erfc(z)
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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Transcribed Image Text:Suppose that copper Cu atoms
Complementary Error Function erfc
diffuse from the surface into a
piece of aluminum Al that is
0.9
initially pure. If it takes 7 hours
0.8
to achieve a concentration of
0.7
0.20wt% Cu at a depth of
0.6
0.2mm into the Al when the
0.5
diffusion process is carried out
at 600°C (D is 5.3x10-13 m²/s),
O 0.4
what is the concentration at
0.3
the surface of the Cu?
0.2
Assume that the 'semi-infinite
0.1
approximation' is valid for this
process. (A plot of the erfc
0.5
1
1.5
2
function is provided at right.)
erfc(z)
1.
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