You have a sample of 50 mL cola drink that contains 55 mg of dissolved caffeine. Calculate the total mass of caffeine extracted using 36 mL of dichloromethane in each of the following procedures: the entire volume of dichloromethane is used in one step; the dichloromethane is divided into two (18 mL) portions in a two - step extraction and into three (12 mL) portions in a three - step extraction.