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An aqueous waste stream containing 3.25% by weight of a phenolic compound is to be extracted with one-third its volume of methylene chloride. The distribution

An aqueous waste stream containing 3.25% by weight of a phenolic

compound is to be extracted with one-third its volume of methylene

chloride. The distribution data of this compound between water and

methylene chloride are:

How many stages are required to recover 98% of this compound?

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