kindly help me with this problem thank you ill give like for the answer mixture consists of a certain amount of caffeine dissolved in 100 ml. of water

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.20QAP
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kindly help me with this problem thank you ill give like for the answer

mixture consists of a certain amount of caffeine dissolved in 100 ml. of water

a) How much caffeine was originally used when 0.31 g of the organic compound was devolved n watt:, and 150 ml ether was used as extraction solvent 

b)  How much was dissolved n ether

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