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Homework Help: Isobaric expansion

  1. Jan 26, 2010 #1
    Given: working fluid is an Ideal gas

    P=30 psi

    Q. what is initial state of the gas when?

    Isobaric expansion to 3ft3
  2. jcsd
  3. Jan 26, 2010 #2
    Isn't what they gave you the initial state of the gas?
  4. Jan 26, 2010 #3
    ok finial state--sorry
  5. Jan 26, 2010 #4
    Since the expansion is isobaric, the pressure stayed the same. They also specified the final volume, so all you need is the final Temperature. You already know the initial states for PiVi = nRTi (except for the moles); the final temperature in PfVf = nRTf can be found by setting the moles of the initial state and the moles of the final state equal to each other.
  6. Jan 26, 2010 #5
    I throught is was

    PiVi/Ti = P2V2/T2 ?
  7. Jan 27, 2010 #6
    P1V1 = nRT1
    P2V2 = nRT2

    nR = P1V1/T1 = P2V2/T2
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