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5. When shortcut methods such as the KSB equations, the Underwood equations, and the Fenske equation are used to compute outlet concentrations and heat duties

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5. When shortcut methods such as the KSB equations, the Underwood equations, and the Fenske equation are used to compute outlet concentrations and heat duties for distillation columns, two major assumptions are made. List those assumptions, and discuss common cases in which they might be violated

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