Mass Transfer
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are

Parallel
Neither A nor B
Both A & B
Straight

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Mass Transfer
McCabe-Thiele method

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

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