Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is equal to the volumetric diffusivity
Is independent of pressure
Varies directly as the pressure
Varies inversely as the pressure

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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
Cannot be computed
Is the optimum reflux ratio
Is computed from the intercept of the operating line

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