Mass Transfer
The expression, y(1 - x)/x(1 - y) is for

Murphree efficiency
Selectivity
Absorption factor
Relative volatility

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Mass Transfer
Priming in a distillation column

Is characterised by the presence of foam throughout the space between trays
Is desirable from point efficiency consideration
Reduces the overall pressure drop
Results from very low gas velocity

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
All of these

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