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1 7 . In an extraction process, the feed contains 1 0 % by weight of the target solute. If 1 0 0 0 grams

17. In an extraction process, the feed contains 10% by weight of the target solute. If 1000 grams of feed are processed, how much solute is present?
18. If the distribution coefficient for a solute between two phases is 0.5, and the concentration of the solute in the initial phase is 200 mg/L, what is the concentration of the solute in the second phase after equilibrium?
19. During solvent recovery, 85% of the solvent is recaptured from the extraction process. If the initial use was 200 liters, how many liters of solvent are recovered?
20. A multistage extraction process with 5 stages achieves a solute recovery of 95%,90%,85%,80%, and 75% in each stage respectively. If the initial solute amount is 100 grams, how much solute is recovered after all stages?

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