Mass Transfer
Molecular diffusion is caused by the

Transfer of molecules from low concentration to high concentration region
Activation energy of the molecules
Thermal energy of the molecules
Potential energy of the molecules

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

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

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