Mass Transfer
McCabe-Thiele method

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

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows negative deviation from ideality
Multicomponent distillation is involved
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality

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