Mass Transfer
Molecular diffusion is caused by the

Thermal energy of the molecules
Potential energy of the molecules
Transfer of molecules from low concentration to high concentration region
Activation energy of the molecules

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Mass Transfer
Heat load in a cooling tower

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

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