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Homework Help: Basic Kinetic Theory Problem

  1. Jan 7, 2010 #1
    1. The problem statement, all variables and given/known data

    A sample of an ideal gas is both compressed and cooled. The given variables for the gas are: P1 = 90.0 kPa, V1 = 0.0800 m3, V2 = 0.0400 m3, T1 = 300. K, T2 = 260. K. Calculate the final pressure.

    2. Relevant equations

    P1 V1 /T1 = P2V2 / T2

    3. The attempt at a solution

    P2 = T1 V / P1V T2
    = 299*1.29 / 1.40 *315 * 1.29
    P2 = 0.67 atm

    ***I thought i was doing this right, but webassign says it's wrong... please advise?
  2. jcsd
  3. Jan 7, 2010 #2
    this is wrong already. mulitply your first equation by T2 and then divide by V2.
    What are all those numbers that aren't in the problem statement?
    I suppose the answer should be in kPa as well.
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