Mass Transfer
Which of these columns incurs the lowest pressure drop?

Packed column (with stacked packing)
Packed column (with dumped packing)
Bubble plate column
Pulse column

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Phase change of the solute as it dissolves in the solvent
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Diffusion of the solute through the solvent in the pores to the outside of the particle
All of these

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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

The fraction vaporised but not the product composition
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

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