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Mass Transfer

Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

Gm
Kg
Litre
m³

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Mass Transfer
In McCabe-Thiele method, at infinite reflux ratio

Both the operating lines coincide with diagonal
The overhead product is minimum
Neither A nor B
Both A & B

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Mass Transfer
Flooding results in

Low tray efficiency
Good contact between the fluids
High tray efficiency
High gas velocity

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

0.5 to 0.8
2.5 to 3.5
0.8 to 1.2
1.25 to 2.0

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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 a binary mixture with low relative volatility,

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

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