**A1.** The Fenske equation:

**a.** Is valid only for binary systems.

**b.** Was derived for minimum reflux.

**c.** Requires constant molal overflow (CMO).

**d.** Requires constant K values.

**e.** All of the above.

**f.** None of the above.

**A2.** If you want to use an average relative volatility, how do you calculate it for the Underwood equation?

**A3.** Develop your key relations chart for this chapter.

**A4.** In multicomponent distillation the Fenske equation can be used to:

**a.** Estimate the fractional recoveries of the nonkeys at total reflux.

**b.** Calculate the number of equilibrium contacts at minimum reflux.

**c.** Estimate the average K value of the light key at total reflux.

**d.** All of the above.

**e.** None of the above.

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