Mass Transfer
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

Continuous distillation
Solvent extraction
Absorption
Evaporation

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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
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of these

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