Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-1 cm²/sec
10-4 cm²/seC₂
10-9 cm/sec
10-3 sec/cm

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

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the cooled water leaving the tower
None of the listed here
Hot water entering the tower and the wet bulb temperature of the surrounding air

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the room temperature
Vapour is in equilibrium with the liquid at the gas temperature
None of the listed here
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature

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