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December 20, 2014

Homework Help: chemistry

Posted by Brad on Wednesday, December 12, 2012 at 6:20pm.

The vapor pressure of pure water at 70C is 231 mm Hg. What is the vapor pressure depression of a solution of 115 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of water? Use molar masses with at least as many significant figures as the data given.

I got 200. by using P(solution)= X(mole fraction of solvent) * P(solvent). I still got it wrong.
This is what I did: P(sln)= (11.4/13.2) * 231

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