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Homework Help: Finding net work done on an ideal gas.

  1. Apr 27, 2009 #1
    1. The problem statement, all variables and given/known data

    An ideal gas with gamma = 1.4 occupies 5.0 L at 300 K and 130 kPa pressure and is compressed adiabatically until its volume is 2.0 L. It's then cooled at constant pressure until it reaches 300 K, then allowed to expand isothermally back to state A. Find the net work done on the gas.

    2. Relevant equations

    I used W=[(P_2)(V_2)-(P_1)(V_1)]/(1-gamma) for the adiabatic state, W=p(delta V) for the constant pressure state, and W=nRTln(V_2/V_1) for the isothermic state.

    3. The attempt at a solution

    I got -18 as my answer, but apparently it's wrong. Could it possibly be a mathematical error?
  2. jcsd
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