Most liquids follow Trouton's rule, which states that the molar entropy of vaporization lies in the range of 88 ± 5 J/mol-K. The normal boiling points and enthalpies of vaporization of several organic liquids are as follows:

(a) Calculate for each of the liquids. Do all the liquids obey Trouton's rule?
(b) With reference to intermolecular forces (Section 11.2), can you explain any exceptions to the rule?
(c) Would you expect water to obey Trouton's rule? By using data in Appendix B, check the accuracy of your conclusion.
(d) Chlorobenzene (C6H5Cl) boils at 131.8°C. Use Trouton's rule to estimate ΔHvap for this substance.

Transcribed Image Text:

Normal Boiling Point (C) AH (kJ/mol) 29.1 21.5 38.6 34.4 35.1 vap Substance Acetone, (CH32CO Dimethyl ether, (CH3)20 Ethanol, C2H5OH Octane, CgH18 Pyridine, C$H5N 56.1 -24.8 78.4 125.6 115.3