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

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

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Mass Transfer
In steam distillation, the

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

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