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MASS TRANSFER

Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.152
0.122
0.048
0.079

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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.

27.3
20
18.7
21.7

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Mass Transfer
For a binary mixture with low relative volatility,

Use molecular distillation
An azeotrope may be formed during distillation
Use high pressure distillation
Use steam distillation

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 + Re)
Ri = (1 - Re)/Re
Ri = Re
Ri = Re/(1 - Re)

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Mass Transfer
At a fixed total pressure, humidity depends only on the

Partial pressure of vapour in the mixture
None of these
Density of the vapour
Heat capacity of the vapour

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