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KD = (Solubility in organic solution (g/mL))/(Solubility in aqueous solution (g/mL) ) , and KD for...

KD = (Solubility in organic solution (g/mL))/(Solubility in aqueous solution (g/mL) ) , and KD for caffeine in a water/dichloromethane system is 7.8. If 5.0 g of caffeine is dissolved in 100 mL of water, how many extractions using 50 mL of dichloromethane are required to recover 95% of the caffeine from the water?

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