Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

The latent heat of vaporisation of the more and less volatile components are greatly different
A total condenser is used
An azeotrope forms
Saturated feed is not used

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Mass Transfer
A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

The mixture exhibits an azeotrope at 101.3 kPa
The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
The mixture contain optical isomers
The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10

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