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

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

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Mass Transfer
To get high tray efficiency

Time of contact between the two phases should be less
Gas velocity should be very low
Liquid entrainment should be severe
Interfacial surface between liquid and gas phase should be large

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