Practice question · Numerical answer
A liquid boils at 350 K with an enthalpy of vaporisation of 35 kJ/mol. Compute its entropy of vaporisation in J/mol/K.
Hints
- At the boiling point the liquid and vapour are in equilibrium, so dG is zero.
- Compute 35000/350.
Show the answer
100 (answers within ±1 count)
Why
J/mol/K. Most liquids cluster near 88 J/mol/K (Trouton’s rule); a markedly higher value signals strong hydrogen bonding in the liquid.
Practise Physical Equilibria and Phase Diagrams
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