Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.94
0.54
1.24
1.04

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Mass Transfer
Molecular diffusion is caused by the

Transfer of molecules from low concentration to high concentration region
Activation energy of the molecules
Thermal energy of the molecules
Potential energy of the molecules

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Mass Transfer
Steam distillation is not recommended to be used, if the

Liquids decompose, if distilled directly at atmospheric pressure
Azeotropic mixture is to be separated and the final product is miscible with water
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

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