Liquid A has boiling point 80 °C and liquid B has boiling point 100 °C.
Which one will cause faster cooling on evaporation? Give reason.
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Vapour pressure correlates with boiling point inversely. In this case liquid A has a lower boiling point and thus will have higher vapour pressure. Since liquid A has a lower boiling point you can assume that its inter-molecular forces are weaker. Therefore, it is much more likely to become a vapour at lower temperatures and more vapour means more pressure.
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