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Homework Help: Please help with this thermo problem! Its an isothermal expansion.

  1. Sep 4, 2008 #1
    1. The problem statement, all variables and given/known data

    10 moles of an ideal gas at 100 atm pressure are expanded isothermally against a constant pressure of 10 atm, to 10 at. calculate Q W deltaU and delta H (Take temp to be T)

    2. Relevant equations

    PV = nRT
    DeltaH = Q (for constant P)
    DeltaU = Q-W
    U = H+PV
    W = Integral(PdV)

    3. The attempt at a solution

    I wish i knew where to start...
    Isothermal means a constant pressure, in this case 10 atm. ...i just have no idea.

    PV = nRT
    V1 = .8314T
    V2 = 8.314T

    W= Integral(PdV)
    W = PIntegral(dv)
    W = P(v2-v1)
    W = 74.826

    Got IT!
    Last edited: Sep 4, 2008
  2. jcsd
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