Trouton's Rule
According to Trouton's rule, the entropy of vaporization (ΔSvap) for most liquids at their normal boiling point is approximately:
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About This Question
- Subject
- chemistry
- Chapter
- chemical thermodynamics
- Topic
- trouton's rule
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
85 J K⁻¹ mol⁻¹
Trouton's Rule is an empirical relation stating that the entropy of vaporization (ΔSvap=TbΔHvap) is roughly constant for many normal liquids at their boiling point.
- Value: ≈88 J K−1 mol−1 (or about 10.5R).
- This signifies that the change in molecular disorder when moving from a liquid to a gas phase is similar for most substances.
- Exceptions occur for liquids with strong intermolecular forces (hydrogen bonding) like water or HF, which have higher values.
This medium difficulty chemistry question is from the chapter chemical thermodynamics, covering the topic of trouton's rule. It appeared in the 2025 exam.
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