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Final Equilibrium Temperature

  1. Jan 3, 2012 #1
    1. The problem statement, all variables and given/known data
    An adiabatically isolated system consists of 1 mol of a diatomic gas 100K and 2 mol of a solid at 200K separated by a rigid adiabatic wall. Find the equilibrium temperature of system after adiabatic wall is removed, assuming that the solid obeys the Dulong-Petit law.


    2. Relevant equations
    mgascgas(T-100) = msolidcsolid(200-T)

    mgascgas = Qgas = 5/2 nRT ( 5 is degree of freedom, I guess so)

    3. The attempt at a solution

    5/2 nRT = Q = msolidcsolid(200-T)

    4. Answer

    171K
     
  2. jcsd
  3. Jan 3, 2012 #2

    Redbelly98

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    I agree with that answer, though you didn't really show how you got it. You haven't shown how you used the Dulong-Petit law, and msolid shouldn't be part of the calculation.
     
  4. Jan 3, 2012 #3
    The answer was given on back pages of the book. I have not got any answer yet. I dont know how they got that answer.
     
  5. Jan 4, 2012 #4

    Redbelly98

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    What does your book or class notes say about the Dulong-Petit law? You should look that up, it relates the energy of the solid and its temperature change.
     
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