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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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
None of these
Hot water entering the tower and the wet bulb temperature of the surrounding air

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