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gorica

  • 3 years ago

Do you know where can I find how to get relations between heat capacities Cp and Cv for ideal and real gases? Or someone can write it here?

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  1. LvL-Whitey
    • 3 years ago
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    You can always start with Cv=3/2R for a monatomic particle and use Cp=Cv+R. Cv= 5/2R for Diatomic CV= 3R for Polyatomic R is a constant that you know right? Cheers :D

  2. gorica
    • 3 years ago
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    I have to show why is it Cp=Cv+nR for ideal gas and why it is what it is for real gas. I found this, and I am ok with ideal gas... but I am not really clear with real gas :/

  3. LvL-Whitey
    • 3 years ago
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    OooOOooo, That complicates things then :( I'm not sure I can help you further, sorry Cheers :D

  4. gorica
    • 3 years ago
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    thanks anyway :)

  5. ghazi
    • 3 years ago
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    hope this will help you out , hold a sec

  6. ghazi
    • 3 years ago
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    if you are not able to read it , let me know :)

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  7. gorica
    • 3 years ago
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    I think I found what I was looking for... via coefficient of volume expansion Thank you very much

  8. ghazi
    • 3 years ago
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    \[h= u+PV\]\[dh=du+d(PV)\] \[dh=du+d(RT), dh=du+RdT\]\[\frac{ dh }{ dT }=\frac{ du }{ dT }+R\]\[C _{p}=C _{v}+R, C _{p}-C _{v}=R\] you can use this derivation too

  9. ghazi
    • 3 years ago
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    and you are welcome :)

  10. gorica
    • 3 years ago
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    what is h?

  11. ghazi
    • 3 years ago
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    h-- enthalpy u -- internal energy dh/dT -- Cp du/dT-- Cv

  12. gorica
    • 3 years ago
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    is Cp defines as dh/dT or we get it somehow because p=const?

  13. gorica
    • 3 years ago
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    *defined

  14. ghazi
    • 3 years ago
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    yep, Cp is specific heat capacity at constant pressure, and change in enthalpy at with temperature is the same quantity , for ideal gas dh=CpdT and gamma = Cp/Cv

  15. gorica
    • 3 years ago
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    ok. I will read this all again and if I have more questions, I will write them tomorrow, ok? :) thank you again :)

  16. ghazi
    • 3 years ago
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    sure :)

  17. gorica
    • 3 years ago
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    do you maybe have graphs of isotherms of Van der Waals gas and real isotherms and something about thermometer with thermocouple, I can't find it on internet?

  18. ghazi
    • 3 years ago
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    http://bcs.whfreeman.com/chemicalprinciples3e/content/lgraphs/E3004.html

  19. gorica
    • 3 years ago
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    :) thanks :)

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