Help in separation processes, please. Solve what is asked. Realice los balances de materia, por favor.

Extraction of uranyl nitrate.

A 20 wt% solution of uranyl nitrate (UN) in water is to be treated with tributyl phosphate (TBP) to remove 90% of the uranyl nitrate in batchwise equilibrium contacts. Assuming water and TBP are mutually insoluble, how much TBP is required for 100 g of solution if, at equilibrium, (g UN/g TBP) = 5.5(g UN/g H2O)

(b) half is used in each of two consecutive stages (c) two countercurrent stages are used (d) an infinite number of crosscurrent stages is used (e) an infinite number of countercurrent stages is used?

Preferably show the balance and explanation of items D and E. Thank you