Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S > 1
S < 1
S = 1
S = ∞

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Mass Transfer
In saturated gas, the

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

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