Vapour pressure is inversely proportional to:
Correct answer: B. Intermolecular force
- A. Temperature
- B. Intermolecular force
- C. Surface area
- D. All
Explanation
Vapour pressure is inversely proportional to the strength of intermolecular forces. This means that the stronger the intermolecular forces, the lower the vapour pressure. The most important parameter which controls the vapour pressure of a liquid is its temperature. At an elevated temperature, the kinetic energy of molecules is enhanced and capability to leave the surface increases.It causes the increase of vapour pressure. It also does not depend on surface area of a liquid.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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