Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Varies directly as the pressure
Is equal to the volumetric diffusivity
Is independent of pressure
Varies inversely as the pressure

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

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