Discussion
Match each rule or method with what it estimates.
List I
A. Kopp's rule
B. Trouton's rule
C. Kirchhoff's relation
D. Watson correlation
List II
1. the heat of reaction at another temperature
2. the heat capacity of a solid from its elements
3. the latent heat at another temperature
4. the entropy of vaporisation at the normal boiling point
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Four estimating rules for four different quantities. Kopp’s rule adds atomic contributions to estimate the heat capacity of a solid. Trouton’s rule puts the entropy of vaporisation at the normal boiling point near 88 joules per mole kelvin for ordinary liquids. Kirchhoff’s relation corrects a heat of reaction from one temperature to another using the heat capacity difference. And the Watson correlation scales a latent heat to another temperature using the reduced temperature.
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