1. What conditions are true of streams leaving an equilibrium stage? What changes for gas absorption, stripping, and liquid extraction?
2. What is the relationship between the number of stages and liquid flow rate in a staged gas absorber?
3. How many stages are required if a stripping column is to be operated at minimum the minimum gas rate?
4. Derive the operating line for the absorption of a gas in a staged cascade by performing an appropriate material balance from the first to the mth stage.
5. What is the advantage of writing the balance on a solute-free basis?
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