Mass Transfer
McCabe-Thiele method of binary distillation does not assume that the

Heat of mixing is negligible
Sensible heat changes are negligible compared with latent heat changes
Molar latent heats of all components are equal
None of these

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

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

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