Mass Transfer
Minimum reflux ratio in a distillation column results in

Maximum condenser size
Minimum number of trays
Minimum reboiler size
Optimum number of trays

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

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

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