6. Thermodynamics and Kinetics
Enthalpy
35PRACTICE PROBLEM
Given the keto-enol tautomerism below, the relevant bond dissociation energies (BDE), and no knowledge of the mechanism, estimate the equilibrium constant (in 3 s.f.) for the reaction at 298.15 K.
![](https://lightcat-files.s3.amazonaws.com/problem_images/cbfaa0b6bab0766a-1685714107322.jpg)
Relevant BDE values
C―C π bond = 65 kcal/mol
C―O π bond = 85 kcal/mol
2° C―H bond = 95 kcal/mol
RO―H bond = 102 kcal/mol
Given the keto-enol tautomerism below, the relevant bond dissociation energies (BDE), and no knowledge of the mechanism, estimate the equilibrium constant (in 3 s.f.) for the reaction at 298.15 K.
Relevant BDE values
C―C π bond = 65 kcal/mol
C―O π bond = 85 kcal/mol
2° C―H bond = 95 kcal/mol
RO―H bond = 102 kcal/mol