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The question is: 8) A solution contains 150.8 grams of NaCl in 678.3 grams of water....

The question is:

8) A solution contains 150.8 grams of NaCl in 678.3 grams of water. Calculate the vapor pressure of water (in torr) over the solution at 25.0 °C. (Note: The vapor pressure of pure water at 25.0 °C is 23.76 torr.)


The correct answer is 20.90 but I get 22.236. I presumed I needed to use Raoult's law. Found the mole fraction for WATER, at .935864 and multiplied that by 23.76. But my doesn't match the answer sheet. Can somebody straighten me out. I NEED CLEAR STEPS PLEASE!!
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