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Estimating Diffusivity of Freon using known Diffusivity of Methane

  1. Oct 29, 2007 #1
    How can I estimate the diffusivity of a compound such as CCl2F2 (freon-12) using the known diffusivity of methane?

    I would like to estimate it for both air and water. I have a diffusivity value of methane for each medium.

    Any advice/help is much appreciated.
  2. jcsd
  3. Oct 29, 2007 #2
    Ok so I figured it out, after an extensive google search.

    You have to use Graham's law, which states:

    Rate1/Rate2 = (M2/M1)^1/2

    M = Molecular Weight

    (For anyone that cares)
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