Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the partial pressure of A
Partial pressure of component A to the total pressure
Vapour pressure of component A to that of component B
Vapour pressure of component A to the total pressure

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Mass Transfer
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point.(ii) Reflux stream is below its bubble point.

Both condensor and reboiler loads are higher in case (ii) as compared to case (i)
Condenser and reboiler loads are the same in both the cases
Condenser load is the same in both the cases but reboiler load is higher in case (ii)
Reboiler load is the same in both the cases but condenser load is higher in case (ii)

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