Dichloromethane, CH2Cl2 (D) and ethanol, C2H6O (E) are miscible liquids.  At 25.0oC, the vapor pressure of pure D is 353. torr, and that of pure E is 56.1 torr. A solution is prepared that contains 23.3 grams of D and 79.4 grams of E.  What is the vapor pressure of D (PD)? What is the vapor pressure of E (PE)?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter12: Solutions
Section: Chapter Questions
Problem 12.85QE
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Dichloromethane, CH2Cl2 (D) and ethanol, C2H6O (E) are miscible liquids.  At 25.0oC, the vapor pressure of pure D is 353. torr, and that of pure E is 56.1 torr.

A solution is prepared that contains 23.3 grams of D and 79.4 grams of E. 

  • What is the vapor pressure of D (PD)?
  • What is the vapor pressure of E (PE)?

Please explain the interesting numerical result you got.  Why did this happen?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

(d) Which of these liquids would have the higher boiling point?  How do you know?                                                                                                                                                                                                                                                                                                                                                                                

(e) How could you separate these liquids? Name the process and describe it in your own words.                                                                                                                                                                                                                                                                                       

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