Mass Transfer
The commonly used solvent in supercritical extraction is

Carbon dioxide
Methyl ethyl ketone
Water
Carbon tetrachloride

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

Hot water entering the tower and the wet bulb temperature of the surrounding air
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

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