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Find the final temperature? (Ideal Gas Law)

  1. Jul 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the final temperature?

    PV relationship -- PV^1.2 = constant

    P1 = initial pressure = 720 kN/m^2
    V1 = initial volume = 0.4 m^3
    V2 = final volume = 1.2 m^3
    T1 = initial temperature = 225 C

    I managed to get the final pressure part out of the way but don't know where to head with the temperature. Can someone please point me in some direction?

    2. Relevant equations



    3. The attempt at a solution

    The attempt at a solution and question can be found here: http://i45.photobucket.com/albums/f98/pastilles/Scan10012.jpg [Broken]

    Thanks for your help :)
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jul 17, 2009 #2

    Q_Goest

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    Hi elephunk, welcome to the board. Your work looks good... you did it right but it looks like you made a mistake in the math.
     
  4. Jul 18, 2009 #3
    Hi,

    Thanks for the welcome :)

    Can you point me to where I am going wrong? Maybe looking at this at nearly 1am in the morning isn't good :(
     
  5. Jul 18, 2009 #4

    Redbelly98

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    Your final pressure looks good, but your final temperature does not. The method seems correct, so it's probably a simple arithmetic error.
     
  6. Jul 18, 2009 #5

    Q_Goest

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    It looks from your attachment that you've calculated the final temperature to be 4 K. Is that what you meant the answer to be?
     
  7. Jul 18, 2009 #6
    Your math seemed okay to me. What about this? Its been a while since Chem I but maybe?!?!

    http://img199.imageshack.us/img199/9922/scannedimage038.jpg [Broken]
     
    Last edited by a moderator: May 4, 2017
  8. Jul 24, 2009 #7
    Thanks. It was a math error.

    Got it sorted now. Thanks all and thinks lizzyb for the the working out :)
     
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