Mass Transfer
Drying operation under vacuum is carried out to

Dry materials having high bound moisture content
Increase drying temperature
Dry those materials which have very high unbound mositure content
Reduce drying temperature

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

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Mass Transfer
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)

None of these
Kc = Kp = Km
Kc = Kp . RT = Km . RT/p
Kc = Kp/RT = Km . RT/P

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