Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Bubble cap tower
Wetted wall tower
Grid tray tower
Perforated tray tower

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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
All of these
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

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