Mass Transfer
In steam distillation, the

Temperature is higher than the boiling point of either component
Product must be immiscible with water
Temperature is 100°C
Temperature is more than 100° C

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only liquid phase obeys Dalton's law
Only vapor phase follows Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law

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