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Homework Help: Root mean square velocity of CO2 molecules

  1. Feb 26, 2008 #1
    1. The problem statement, all variables and given/known data

    If the translationa speed of the water vapor molecules (H2O) in ir is 648 m/s, what is the translational rms speed of the carbon dioxide molecules in the same air? Both gases are at the same tmperature.

    2. Relevant equations

    V^2 = (3kT)/m

    3. The attempt at a solution

    I'm not even sure where to begin. I don't understand how knowing the water's speed helps me find the CO2's.
  2. jcsd
  3. Feb 26, 2008 #2


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  4. Feb 26, 2008 #3
    They must be the same.
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