Estimating Diffusivity of Freon using known Diffusivity of Methane

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To estimate the diffusivity of CCl2F2 (freon-12) using the known diffusivity of methane, Graham's law can be applied. This law relates the rates of diffusion of two gases to their molecular weights, allowing for the calculation of diffusivity ratios. By substituting the molecular weights of methane and freon-12 into the equation, the diffusivity for both air and water can be derived. The discussion emphasizes the importance of molecular weight in estimating diffusivity. Understanding this relationship is crucial for accurate estimations in various mediums.
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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.
 
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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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