Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Avoid flooding
Avoid channeling
Reduce liquid hold up
Minimise the overall pressure drop

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

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