Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

100
Between 0 and 100
50

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Mass Transfer
Which of the following processes is not an example of adsorption applied to gaseous separations?

Removal of objectionable odour and impurities from industrial gases
Recovery of valuable solvent vapors from dilute mixture with air and other gases
Decolouration of yellow glycerene
Dehumidification of air and gas

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Mass Transfer
At equilibrium the concentration of water in vapour phase (C*)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

1
0.4
0.2

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