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Homework Help: Transfer of Heat Question

  1. Jan 31, 2006 #1
    If the translational rms speed of the water vapor molecules (H2O) in air is 676 m/s, what is the translational rms speed of the carbon dioxide molecules (CO2) in the same air? Both gases are at the same temperature.

    So what I have so far...

    VrmsH20 = squareroot of 3RT/mCO2
    VrmsCO2 = squareroot of 3RT/mCO2

    676 = squareroot of mCO2/mH2O

    And I already found the mass of the CO2 and H2O, but then i'm stuck... Can anyone help please???
  2. jcsd
  3. Jan 31, 2006 #2
    [tex] V_{rms} = \sqrt{\frac{3RT}{M}} [/tex]

    since the temperature is the same, think proportion.
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