Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-3 sec/cm
10-9 cm/sec
10-4 cm²/seC₂
10-1 cm²/sec

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Mass Transfer
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption termina
As the acetone concentration increases, the solubility curves approach each other
All of these
Both the phases become identical at a particular common point on both the solubility curves called the plait point

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Mass Transfer
Blowdown in a cooling tower

Is undesirable
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Increases the scale forming tendencies of water
All of these

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