Mass Transfer
Heat load in a cooling tower

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

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Mass Transfer
In a counter-current liquid extractor

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

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