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

0.122
0.079
0.152
0.048

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Mass Transfer
In steam distillation, the

Temperature is more than 100° C
Product must be immiscible with water
Temperature is 100°C
Temperature is higher than the boiling point of either component

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