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New pressure of a gas when the volume changes at const Temperature

  1. May 19, 2013 #1
    1. The problem statement, all variables and given/known data
    pumpQ_zpsfbc48895.jpg


    2. Relevant equations
    At constant temperature
    then P1V1=P2V2

    3. The attempt at a solution
    This is my attempt at the solution
    pumpA_zpscb71ca03.jpg

    however the mark scheme says

    pumpMS_zps50532314.jpg

    Any help appreciated?
    I just can't see what I am not seeing?
     
    Last edited: May 19, 2013
  2. jcsd
  3. May 19, 2013 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    I think there is a typo in the question. The volume in the bottle is much greater than the volume in the pump chamber in this diagram. I suspect that the questioner intended the volume of space in the pump chamber to be 6.5 x 10-5 m3 (.065 l). If that were the case, the given answer is correct.

    AM
     
  4. May 19, 2013 #3
    Andrew your a star, I would never have seen that.
    Thanks again for your help
    D
     
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