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Enthalpy Calculation

thermodynamics excess properties

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#1 Ciro Baiaba

Ciro Baiaba

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Posted 15 February 2021 - 09:52 AM

Hello guys!

 

I'm trying to calculate specific enthalpy of a binary solution. It's a homework problem. 

 

The solution is described as two miscible liquids (1 and 2). Conditions are usually given at mild temperatures and pressures close to atmospheric.

 

Also, it's stated that I should use as a reference state the standard state at 25 ºC - that is, pure real liquids at 1 bar and 25 ºC.

 

The only data given is the solution heat capacity, which is expressed as:

 

C= CP(ideal solution) + CP(excess)

CP(x,T) = (a1+b1T)*x + (a2+b2T)*(1-x) + (a0+b0T)*x3*(1-x)2

 

Where "x" is the molar fraction of liquid "1"; "ai" and "bi" are constants.

 

How could I do this?

 



#2 latexman

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Posted 15 February 2021 - 10:51 AM

dH = Cp dT

Delta H = ʃ Cp dt

Edited by latexman, 15 February 2021 - 10:39 PM.


#3 Ciro Baiaba

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Posted 15 February 2021 - 12:01 PM

dH = Cp dT

 

DH = ʃ Cp dt

 

Actually the "hint" is that this is not the answer...



#4 breizh

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Posted 15 February 2021 - 10:23 PM

Hi,

We don't do home work but we are happy to help !

Please share with us your work and tell us your difficulties .

Good luck

Breizh 



#5 latexman

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Posted 16 February 2021 - 07:42 AM

Actually the "hint" is that this is not the answer...

 

 

I agree, but it is the right method.  I wasn't going to spoon feed the answer to you.  We don't do that here.  They want YOU to do the integration on the equation and present those end results as the answer.

 

If that is not right, then I hope it is an even numbered problem.


Edited by latexman, 17 February 2021 - 08:59 AM.





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