1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Molar enthalpy of a gas at various temperatures

  1. Nov 23, 2011 #1
    1. The problem statement, all variables and given/known data
    I'm given the molar enthalpy of a gas at various temperatures.

    For each temperature, the enthalpy at 1 bar and 100 bars of pressure is listed.

    The question: The gas moves through a tube. The pressure in the tube is 100 bar. When the gas exits the tube, the pressure is 1 bar. (Hint: the enthalpy is conserved).

    What is the lowest temperature at which some liquefaction takes place?

    2. Relevant equations



    3. The attempt at a solution
    The chart says that at 1 bar and 77 K (liquid), the gas' enthalpy is -3407 J.

    At 1 bar and 77 K (gas), the gas' enthalpy is 2161 J.

    I think I'm supposed to find the temperature in the 100 bar part at which some liquifaction takes place. I am just not sure whether to use the liquid enthalpy or the gas enthalpy. Once I know the enthalpy, I can get the temperature.
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Molar enthalpy of a gas at various temperatures
  1. Molar Entropy Of A Gas (Replies: 1)

Loading...