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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm²/seC₂
Cm/sec
Cm²/sec
Cm³/sec

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Mass Transfer
Leaching of sugar from sugar beets is done by

Dilute H₂SO₄
Hexane
Lime water
Hot water

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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
0.048
0.079
0.122

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Mass Transfer
Which of the following is an undesirable property in a tower packing?

Large free cross-section
Large surface per unit volume
Low weight per unit volume
Large weight of liquid retained

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
9
8
1

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Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Gas absorption
Binary distillation
Adsorption
Humidification

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