Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Both liquids flow at fixed rate
Liquid's flow rate depends upon the temperature and pressure
Only one of the liquids may be pumped at any desired rate

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Mass Transfer
Heat load in a cooling tower

Means the amount of heat thrown away (KCal/hr.) by the cooling tower
Neither A nor B
Both A & B
Is equal to the number of kg, of water circulated times the cooling range

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