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
Inside the distillation column, the

Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop
None of these
Liquids are not always at their bubble points

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