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Find the final internal energy of a gas.

  1. Nov 8, 2012 #1
    1. The problem statement, all variables and given/known data
    A thermally isolated container is filled with 2.3 mol of an ideal gas at T = 0°C.The gas is then compressed from 1.9 m3 to 0.3 m3. What is the final internal energy U of the gas? (Assume the process occurs at constant pressure.)

    2. Relevant equations
    U=3/2nRT
    U=Q+W
    W=pΔV
    pV=nRT


    3. The attempt at a solution
    Q=0, so U=W

    p(1.9)=(2.3)(8.314)(273.15)
    p(1.9)=5223.2
    p=2749.1

    W=pΔV
    =(2749.1)(0.3-1.9)
    =(2749.1)(-1.6)
    =-4398.6

    The actual answer is 1.24kJ.

    I attempted this as well just to see.

    U=3/2nRT
    =3/2(2.3)(8.314)(273.15)
    =7834.8

    Clearly I am lost. Any help would be greatly appreciated.
     
  2. jcsd
  3. Nov 8, 2012 #2
    Nevermind. I got it :D
     
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