Estimating Diffusivity of Freon using known Diffusivity of Methane

[lewdtenant]

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.

 

[lewdtenant]

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)