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What is the total translational kinetic energy of the gas molecules

  1. Jul 11, 2009 #1
    1. The problem statement, all variables and given/known data
    What is the total translational kinetic energy of the gas molecules of 0.450 mol of air at atmospheric pressure that occupies a volume of 5.00 L (0.00500 m3)?


    2. Relevant equations
    P=2/3(N/V)<Ktr>
    N= 0.450 mol
    V= 5.00L
    Want to find Ktr


    3. The attempt at a solution
    The problem is I don't know the pressure to use this formula or how to figure out what it is from the given information, if that's possible.
     
  2. jcsd
  3. Jul 11, 2009 #2

    jgens

    User Avatar
    Gold Member

    Well, atmospheric pressure is 1 atm = 760 mm Hg = 101.3 kPa.

    If you need more help, given that the translational kinetic energy of one molecule of gas is KE = 3kT/2, use the formula PV = NkT to derive the formula for the case that you're dealing with.
     
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