Mass Transfer
Mass transfer co-efficient is defined as

Flux=concentration difference/co-effi-cient
Co-efficient = Flux/concentration difference
Flux = Co-efficient/concentration difference
None of the listed here

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases
Total cost first decreases and then increases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system

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