How to calculate a rough estimate for the volume of a nitric oxide molecule?

I was wondering what would be the best way to calculate a rough estimate for size of a nitric oxide molecule to use in comparison to a box. 


I was thinking volume would be the best method, but this gave me an answer in dm3/mol which I can't use for comparing against the volume of a box.




Take the volume per mole value (b) from a [van der waals constants table](http://courses.chem.indiana.edu/c360/documents/vanderwaalsconstants.pdf) (0.0289 L/mol) and divide by $6.022 \times 10^{23}$ molecules per mole.


This will give you a volume that you can compare to the box.


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On the MP2/def2-QZVPP level of theory the $\ce{NO}$ bond length is $\pu{113.5 pm}$ and the molar volume is estimated based on $\pu{0.001 e/bohr3}$ density envelope as $\pu{241.539 bohr3/mol}$ or $\pu{21.555 cm3/mol}$. The molecular volume therefore is about $\pu{3.58\times10^-29 m3}$.


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