Mass Transfer
McCabe-Thiele method

Is more accurate than Ponchan-Savarit method
Uses weight fractions to express liquid and vapour composition
Can use any type of units
Uses molal units for material and energy balance

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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

Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
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

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