Mass Transfer
In liquid extraction, if the selectivity is unity, then

Amount of solvent required will be minimum
Separation of the constituents is the most effective
No separation will occur
Solvent flow rate should be very low

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Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Vapour laden gas at 1 atm. and room temperature
Vapour laden gas at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and room temperature

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