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Thermodynamics- rms translational kinetic energy

  1. Sep 5, 2013 #1
    1. The problem statement, all variables and given/known data
    A container having a volume of 1m^3 holds 5 moles of helium gas at 50C. If the helium behaves like an ideal gas, the rms translational kinetic energy is?

    2. Relevant equations
    Total E= 3/2 nRT


    3. The attempt at a solution
    I tried solving this question using this equation, but I did not get the right answer.
    The correct answer is 6.7 x 10^-21 J
     
  2. jcsd
  3. Sep 6, 2013 #2

    ehild

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    Welcome to PF!

    Please, show your work.


    ehild
     
  4. Sep 6, 2013 #3
    Total Ek= 3/2 nRT
    = 3/2 x 5 x 8.314 x 323
    = 20140.7J, but this answer is wrong
     
  5. Sep 6, 2013 #4

    vela

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    The problem is asking for the energy per atom.
     
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