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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re
Re0.33
Re0.83

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Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Peclet number
Thermal diffusivity
Momentum diffusivity
Stanton number

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Mass Transfer
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

L/G
None of these
Always < 1
G/L

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Mass Transfer
Steady state equimolal counter diffusion is encountered in

Absorption of NH₃ from air by water
All of these
Separation of a binary mixture by distillation
All liquid-liquid diffusion systems

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Mass Transfer
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

0.25
0.175
0.4
0.2

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Mass Transfer
Which of the following mixtures does not form an azeotrope at atmosheric pressure?

None of these
Methyl alcohol-acetone
Water-alcohol
Butyl acetate-water

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