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Why is it necessary to keep temperature the same while comparing vapour pressure?

Answer and explanation

Correct answer: Because vapour pressure changes with temperature

Vapour pressure depends strongly on temperature because temperature changes the kinetic-energy distribution of liquid molecules. A warmer liquid generally has more molecules able to escape, producing a higher vapour pressure. If two liquids are measured at different temperatures, the result mixes temperature effects with composition or intermolecular-force effects, so the comparison is not fair.

Related tags

Temperature ComparisonVapour PressureEquilibrium In Physical And Chemical ProcessesEquilibriumChemistryClass 11 Mcq

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