Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

18.7
20
27.3
21.7

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Increases due to liquid entrainment
Is a function of the mass transfer between liquid and vapour
Increases due to foaming

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