Mass Transfer
Steam distillation is used for separation of high boiling

none of the listed here
Volatile impurity from still higher boiling substances
Substances from non-volatile impurities
Both of the options given here

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Results from very low gas velocity
Is characterised by the presence of foam throughout the space between trays
Reduces the overall pressure drop

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Mass Transfer
Henry's law states that the

Partial pressure is equal to the product of the mole fraction and total pressure
Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Vapour pressure is equal to the product of the mole fraction and total pressure

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