Which has maximum vapour pressure?
Correct answer: C. CH4
- A. Xe
- B. Br2
- C. CH4
- D. All same
Explanation
Vapour pressure is the pressure exerted by a vapour in equilibrium with its solid or liquid form at a given temperature. The higher the vapour pressure, the more easily the substance will vaporize.CH4 has a lower boiling point than Br2 and Xe, which means that it has weaker intermolecular forces and a higher vapour pressure.CH4 has a boiling point of -161.5°C.
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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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