Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NPr = NLe
NSc = NPr = NLe
NSc = NLe
NSc = 1

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Mass Transfer
McCabe-Thiele method

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

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