density and molar concentration


by mech-eng
Tags: concentration, density, molar
mech-eng
mech-eng is offline
#1
Oct30-13, 09:19 AM
P: 81
Hi,all.
a book(j.p holman,heat transfer 7e,chapter 11) gives
C (subindex)A = (ro) subindex A= P subindex A x M subindex A / Ro(universal) T

but another book(stanley middleman,an introduction to mass and heat transfer) gives
Ci=(ro)i/Mi. these are very different from each other.Ci is total molar concentration of
that species and ro is density that is mass concentration to be used in Fick's law.which one is true?
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Chestermiller
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Oct30-13, 11:13 AM
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Quote Quote by mech-eng View Post
Hi,all.
a book(j.p holman,heat transfer 7e,chapter 11) gives
C (subindex)A = (ro) subindex A= P subindex A x M subindex A / Ro(universal) T

but another book(stanley middleman,an introduction to mass and heat transfer) gives
Ci=(ro)i/Mi. these are very different from each other.Ci is total molar concentration of
that species and ro is density that is mass concentration to be used in Fick's law.which one is true?
The holman equation is for the mass density CA of a species in an ideal gas if the species partial pressure is PA. So ρoA is the mass density.

In the middleman equation, ρi is the mass density of species i in a liquid or a gas, and Ci is the molar density of the species.


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