On which factors the vapour pressure of a substance does not depend?
Correct answer: C. Surface area
- A. Physical state of matter
- B. Intermolecular forces
- C. Surface area
- D. Temperature
Explanation
Option B: A liquid's vapor pressure is directly related to the intermolecular forces present between its molecules. The stronger these forces, the lower the rate of evaporation and the lower the vapor pressure. Option: C The vapor pressure of a substance does not depend on the surface area as the surface area of a solid or liquid in contact with the gas does not affect vapor pressure. Option D: As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases. The vapor pressure of a liquid can be measured in a variety of ways.
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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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