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THERMO CHEM Heat Cap

  1. Sep 24, 2013 #1
    1. The problem statement, all variables and given/known data
    The problem provides two paths. P1,V1,T1------->P1,V2,T3 (this is the only one i do not understand) for AN IDEAL GAS reversible expansion

    Pressure---constant
    Volume---not constant
    Temperature---not constant

    Calculate the q(rev)=? work(rev)=? and ΔU=?

    2. Relevant equations



    3. The attempt at a solution

    Because the pressure is constant I assumed that Cp(heat cap@ constant pressure) should be used instead of Cv (heat cap@constant volume)

    so...

    Work(rev)=∫Cp(T)dT however the book says use ∫Cv(T)dT why is this?

    It does not make sense to me because the pressure is constant and the volume changes so why use Cv over Cp Cp=5/2*R Cv=3/2R or is the book stating that the change in volume is so small that we can still use Cv(T).

    Any help would be greatly appreciated

    Thank you
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 25, 2013 #2

    DrClaude

    User Avatar

    Staff: Mentor

    Which book is that?
     
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