Question: A solution composed of 25% solute A and 75% B is fed at a rate of 120 kg/min to a multi-stage liquid-liquid extraction process. Pure

A solution composed of 25% solute A and 75% B is fed at a rate of 120 kg/min to a multi-stage liquid-liquid extraction process. Pure solvent C enters countercurrently at a rate equal to 1.5 times the minimum required. Determine what the solvent/feed ratio is if the final composition of the raffinate must be 0.05 and the number of stages required in the process.

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