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Calculating a molecular diameter from 2nd virial coefficient?

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impaler:
Hi all

I'm a chemical engineer so please go easy on me  :)

I've been trying to calculate molecular diameters for gaseous O2, H2O, SO2 and SO3.  To start with, I tried using equations based on viscosity such as this one, but for some reason the values are always 2-3 times larger than I expected.

Is it true that I can calculate a molecular diameter from the "second virial coefficient" and if so, how would I go about it?

Thanks in advance for your *delete me*

FeLiXe:
with mean free path you get the effective collision radius
it is bigger than the atomic radius the or van der Waals radius

maybe that is the problem

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