Practice question · Select all that apply
Which statements about vapour pressure are correct?
Hints
- Vapour pressure is an intensive property.
- Intensive properties do not care how much material is present.
Show the answer
- A. It rises as temperature rises
- C. It is higher for liquids with weaker intermolecular forces
- D. It equals the external pressure at the boiling point
Why
Vapour pressure is fixed by temperature and the strength of the intermolecular forces alone. Pouring in more liquid produces more vapour in total but leaves the pressure unchanged, the mark of an intensive property.
Practise Physical Equilibria and Phase Diagrams
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