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Mass Transfer

Mass Transfer
CO₂ can be absorbed by

Alumina
Hot cupric oxide
Heated charcoal
Cold Ca(OH)₂

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

9.21
0.001
4.605
100

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

0.1
1
0.01
10

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Is greater than
Cannot be predicted as data are insufficient
Is lower than
Is same as

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Mass Transfer
Drift in a cooling tower is

The water entrained by the circulating air
Dependent on the water lost by evaporation
Desirable
All of these

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Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

1
0.24
3.97
600

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