Abstract
The entropy of vaporization of organic non-hydrogen bonding compounds can be estimated by using the following modifications of Trouton's rule: (1) for rigid molecules, ΔS v= 20cal/deg·mole; (2) for long chain derivatives of such molecules, ΔS v= 20 + 0.16(n−5)cal/deg·mole, where n is the number of flexible links in the chain, and n> 5. These simple rules provide a good estimation for the entropy of vaporization which is sufficiently accurate to obtain reasonable estimations of vapor pressure.
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