Mass Transfer
In distillation, overhead product contains

Only saturated liquid
Any number of components
Two components
Only one component

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to that of component B
Partial pressure of component A to the total pressure

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