Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

More number of trays are required and the residue composition is more dilute in methanol
Less number of trays are required
Composition of the residue remains unchanged
More number of trays are required but the residue composition remains unchanged

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Both A & B
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Pr = Sc ; there won

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Mass Transfer
When the solvent dissolves very little of solute, then

Very small quantity of solvent is required
Solvent of low freezing point should be used
Solvent of low latent heat of vaporisation should be used
Large quantity of solvent is required to extract the solute

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Mass Transfer
Dew point of an air-water vapor mixture

At constant humidity & total pressure is fixed
Decreases with decrease in pressure
All of the listed here
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve

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