Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The product composition as well as the fraction vaporised
The product composition but not the fraction vaporised
Neither the product composition nor the fraction vaporised
The fraction vaporised but not the product composition

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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 the optimum reflux ratio
Is computed from the intercept of the operating line

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