Mass Transfer
McCabe-Thiele method

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

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to the total pressure
Vapour pressure of component A to that of component B
Partial pressure of component A to the total pressure

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Is computed from the intercept of the operating line
Is the optimum reflux ratio
Cannot be computed
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve

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

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

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