Most liquids follow Troutons rule (see Exercise 19.95),

Chapter , Problem 19.107

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Most liquids follow Troutons rule (see Exercise 19.95), which states that the molar entropy of vaporization is approximately 88 { 5 J>mol@K. The normal boiling points and enthalpies of vaporization of several organic liquids are as follows: (a) Calculate Svap for each of the liquids. Do all the liquids obey Troutons 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 Troutons rule? By using data in Appendix B, check the accuracy of your conclusion. (d) Chlorobenzene 1C6H5Cl2 boils at 131.8 C. Use Troutons rule to estimate Hvap for this substance.

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