Mass Transfer
Dimension of mass diffusivity is the same as that of

Pressure
Surface tension
Dynamic viscosity
Kinematic viscosity

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Mass Transfer
Flash distillation is

Same as simple distillation
Same as differential distillation
Used for multicomponent systems like crude refining
Most useful for handling binary systems

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Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The product composition as well as the fraction vaporised
The fraction vaporised but not the product composition
Neither the product composition nor the fraction vaporised
The product composition but not the fraction vaporised

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