Question: help plzzz! A solution is made using 16.7 percent by mass CH2Cl2 in CHCl3. At 30 C, the vapor pressure of pure CH2Cl2 is 490

help plzzz!

A solution is made using 16.7 percent by mass CH2Cl2 in CHCl3. At 30 C, the vapor pressure of pure CH2Cl2 is 490 mm Hg, and the vapor pressure of pure CHCl3 is 260 mm Hg. The normal boiling point of CHCl3 is 61.7 C. What is the molality of CH2Cl2 in the solution

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