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Homework Help: Ideal Diatomic Gas - Final temp and pressure

  1. Dec 1, 2013 #1
    1. The problem statement, all variables and given/known data
    A 1.00 mol sample of an ideal diatomic gas, originally at 1 atm and 20°C, expands adiabatically to 2.0 times its initial volume. (Assume no molecular vibration.)

    What is the final pressure for the gas?

    What is the final temperature for the gas?
    (it should be near -40 Celcius)

    I can't find anything relatable besides PV=nRT and something with 5/3?

    Any help on where to start would be greatly appreciated! Thank you!
    Last edited: Dec 1, 2013
  2. jcsd
  3. Dec 1, 2013 #2
    Hi cyclonextreme. Welcome to Physics Forums.
    Do you know the equations for adiabatic reversible expansion? If not, look them up in your textbook. Study the section on reversible adiabatic expansion.
  4. Dec 1, 2013 #3
    Thank you!
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