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Homework Help: Adiabatic expansion of an ideal gas

  1. Sep 9, 2016 #1
    1. The problem statement, all variables and given/known data
    An ideal monatomic gas has initial pressure Po and occupies initial volume Vo. The gas undergoes an adiabatic expansion in which the volume is doubled. Calculate in terms of Po and Vo

    a) the final pressure of the gas

    b) the change in its enthalpy during the expansion

    2. Relevant equations
    I posted two attachments with my attempted solutions. All the relevant equations are there. Just posting to see if anyone can spot anything wrong with my solutions. I feel fairly confident about part a, but not so much about part b.

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Sep 10, 2016 #2


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    In part b you treated T as constant during the process.
  4. Sep 10, 2016 #3
    Yeah that's the part I felt most uncomfortable about. Is this the right approach then, or do I have to go about it another way?
  5. Sep 10, 2016 #4


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    Using the equation pVγ=const for adiabatic processes?
  6. Sep 10, 2016 #5
    yes that's it! thanks :)
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