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
0.048
0.152

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Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Separation of sugar from sugar beet by hot water
Recovery of vegetable oils from seeds

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Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of partially mis-cible liquids
The system comprises of an azeotrope
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear
The system comprises of miscible liquids

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