(327.34 g/mol) × (1 mL/1.00 g) = 327 mL/moland the average volume per molecule is
327 mL/mol × (1 mol/6.02×1023 molecules) = 5.43 × 10-22 mL/molecule
These aren't really actual molecular volumes; they're the average contribution each molecule makes to the total volume of the crystal. When the molecules are packed in a regular way (as they are in crystals), these average molecular volumes are easy to relate to the average center-to-center distance between molecules. The relationships are sometimes used to explain volume changes that accompany phase changes.
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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/compounds/faq/print-estimating-molecular-volumes.shtml