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Determine Enthalpy, Entropy, and Chemical Potential

  1. Dec 12, 2016 #1
    1. The problem statement, all variables and given/known data
    Hello, i am given an isothermal transition for nitrogen, N2, where temperature is constant at 700K, p1=1bar, and p2=100bar.
    For this problem i am not allowed to use any equations of states, such as Benedict-Webb-Rubin, or Beattie-Bridgeman. Rather i am given only Cp data, which is in the table below. From only this data below for nitrogen i must determine the Enthalpy, Entropy, and Chemical Potential for the transition phase.
    I am also given the equation below, which im not too sure how to apply it to the problem.

    2. Relevant equations
    R*T (a + b v^-1 + c v^-2 + d v^-3)
  2. jcsd
  3. Dec 12, 2016 #2


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    Staff: Mentor

    Start with definitions of the ΔH, ΔS and ΔG.
  4. Dec 12, 2016 #3
    What are dh, ds, and dg in terms of dT and dP?
  5. Dec 12, 2016 #4
    ##\Delta G## is easy, but I still haven't figured out how to get ##\Delta H## and ##\Delta S##. Are you sure this is the only information they give you? Do they provide any information at any other temperature?
  6. Dec 12, 2016 #5
    I'm guessing that the expression appearing above the table is the functional form they are recommending for the pressure. This is the equation of state. Am I correct?
    Last edited: Dec 12, 2016
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