Mass Transfer
Unit of molal diffusivity is

Gm moles/cm². sec
Cm²/sec gm . mole
Gm moles/cm² . sec
Gm moles/cm. sec

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Mass Transfer
In saturated gas, the

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

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