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Gas Laws and Kinetic Theory

  1. Dec 9, 2012 #1
    1. The problem statement, all variables and given/known data
    The temperature of an ideal gas (M=28kg/mole) has increased 14K by adding 29J of heat at a constant pressure. To cool the gas back to the initaial temperature 20.7J of heat is extracted from the gas at a constant volume. Find the mass of the gas.


    2. Relevant equations
    ΔU=(3/2)nRΔT
    n=number of moles
    R=8.31
    T=temperature
    3. The attempt at a solution
    none
     
  2. jcsd
  3. Dec 9, 2012 #2

    rude man

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    1. ΔT = +14K, Q = 29J: can you use the 1st law to determine the number of moles n as a function of CV, the heat capacity at constant volume?

    2. ΔT = -14K, Q = -20.9J: can you use the 1st law again to determine CV?
    Then you'd have n and of course m = 28kg*n.
     
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