Mass Transfer
Raoult's law is applicable to the

Ideal solutions
Non-ideal gases
Mixture of water and alcohol
Real solutions

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Liquid entrainment should be severe
Time of contact between the two phases should be less
Gas velocity should be very low

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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of individual components in a liquid-liquid system
M.T.C. of liquid in liquid-gas system
Individual mass transfer co-efficient (M.T.C.) in gaseous system
The overall M.T.C. of the system

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