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PV work done question

  1. Aug 27, 2011 #1
    1. The problem statement, all variables and given/known data

    calculate work done to compress 1mole of ideal gas from 1atm to 0.5atm at 298K
    where it is subjected to constant external pressure of 1atm

    2. Relevant equations
    Won = -Integral pdV = -(1atm)(Vf-Vi) = -p(RT/pf - RT/pi) = 2270J

    where i have assumed T does not change, is it correct to assume so?

    because i read that T changes proportionally with V, if so, how do i find what is my (Vf-Vi)

  2. jcsd
  3. Aug 27, 2011 #2


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    Are you sure that you have the question copied correctly. In particular, could you check that the two highlighted quantities should not be volumes?
  4. Aug 29, 2011 #3
    yes thats what the question wrote

    thats why i found it strange.

    shouldn't it be vol, so that its just P(vf-vi)?
  5. Aug 29, 2011 #4


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    That would be my guess. There are two conflicting statements. The first specifies a change in pressure, whilst the second asserts a constant pressure.
  6. Aug 31, 2011 #5
    ok thank you!
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