Mass Transfer
Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

Density
Solubility
Viscosity
Relative volatility

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is the optimum reflux ratio
Cannot be computed
Is computed from the intercept of the operating line

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