question archive Predict which of the following compounds follow Trouton's rule: Liquid Boiling point (K) Enthalpy of vaporization (kJ/mol) o-xylene 417
Predict which of the following compounds follow Trouton's rule: Liquid Boiling point (K) Enthalpy of vaporization (kJ/mol) o-xylene 417
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Predict which of the following compounds follow Trouton's rule:
| Liquid | Boiling point (K) | Enthalpy of vaporization (kJ/mol) |
| o-xylene | 417.5 | 36.24 |
| ethylbenzene | 409.2 | 35.57 |
| nonane | 423.8 | 37.18 |
| chloroform | 334.2 | 29.24 |
| n-propanol | 370.2 | 41.44 |
| ammonia | 239.6 | 23.35 |
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Trouton's rule states that entropy of vaporization should be constant i.e. about 85-88 J mol-1K-1
In the above problem, o-xylene, ethylbenzene, nonane and chlorofom obey trouton's rule as they have the entropy of vaporization 86.80, 86.92, 87.70 and 87.49 J mol-1K-1 respectively
[ I used the formula: delta Svap = Delta Hvap (J/mol) / Tbp (K)]
For n-propanol and ammonia the values are 111.93 and 97.45 J mol-1K-1 . So, these liquids clearly dont obey troutons rule.
