Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

10 metres above ground
At ground level
5 metres above ground
2 metres above the ground

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

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