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Why is vapour pressure low at low temperature?

Answer and explanation

Correct answer: Because molecular kinetic energy is low

At lower temperature, the average kinetic energy of liquid molecules is lower. Consequently, fewer molecules have enough energy to overcome intermolecular attractions and escape through the surface. The equilibrium vapour contains fewer particles and exerts lower pressure. The effect is not caused by a changing name, a smaller container, or vapour becoming heavier.

Related tags

Kinetic EnergyTemperatureEquilibrium In Physical And Chemical ProcessesEquilibriumChemistryClass 11 Mcq

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