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Homework Help: Isothermal reversible expansion

  1. Sep 18, 2009 #1
    1. The problem statement, all variables and given/known data
    Calculate the work done during the isothermal reversible expansion of a gas that satisfies the virial equation of state.

    2. Relevant equations
    Virial equation of state: pVm = RT(1+B/Vm + C/Vm + ...)

    Isothermal reversible expansion: w = -nRT ln(Vf/Vi)

    3. The attempt at a solution
    I tried to substitute n with the expansion, but that is not correct. Any ideas?

  2. jcsd
  3. Sep 19, 2009 #2
    The expression you're using for isothermal reversible expansion is only valid for an ideal gas.

    Remember dw=-P dV.

    Divide both sides of the virial equation of state by Vm and remember Vm=V/n, then you'll need to use calculus.
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