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Explain why an organic liquid vaporises ...

Explain why an organic liquid vaporises at a temperature below its boiling point in steam distillation?

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In steam distillation, water and organic substance vaporise together and total vapour pressure becomes equal to atmospheric pressure i.e.,
Vapour pressure of organic substance + Vapour pressure of water = Atmospheric pressure.
This means that the organic compound vaporises and gets distilled at lower temperature than its boiling point.
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