A solution of methylene chloride (CH2Cl2) and ethanol (CH3CH2OH) that is 10.% methylene chloride by mass is boiling at 75°C. The vapor is collected and cooled until it condenses to form a new solution. Calculate the percent by mass of methylene chloride in the new solution. Here's some data you may need:   normal boiling point density vapor pressure at  75°C methylene chloride 40.°C 1.3g/mL 2263.torr ethanol 78.°C 0.79g/mL 669.torr Be sure your answer has 2 significant digits.   Note for advanced students: you may assume the solution and vapor above it are ideal.

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