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 as well as the fraction vaporised
The fraction vaporised but not the product composition
The product composition but not the fraction vaporised

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Avoid thermal decomposition of a component
Increase the efficiency of separation
Increase the total pressure of distillation

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