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Molar specific heat capacities for gases

  1. May 20, 2010 #1
    For an isochoric process,
    dV = 0
    therefore dW=0
    So from 1st of Thermodynamics,
    dQ = dU + 0
    or, n*Cp*dT = n*Cv*dT (Cp and Cv denote molar heat capacities of the gas at const pressure and volume resp.)

    therefore we get Cp = Cv .(how can this be possible once we know Cp - Cv = R ?)
  2. jcsd
  3. May 20, 2010 #2


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    Homework Helper

    If you are heating at constant volume, how does dQ=ncpdT?

    If dQ=dU

    and dU/dT = cv, then you'll just get Q= ncvΔT
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