Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

All of these
Constant molal overflow
Total reflux
Constant relative volatility

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Mass Transfer
The McCabe Δ L law states that the

Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate depends on the crystal size
Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate does not depend on the crystal size

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