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In class notes for October 24, 2007

In class notes for October 24, 2007 - General Chemistry...

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General Chemistry Lecture 102a In class notes for October 24, 2007 Exam Avg 73 +/- 14 Remainder of Chapter 6 OWL o Due October 31, 2007 Regrade o Exam #2 regrade request due next Wed. Be very worried if the average of your two exams is below 60% Last lecture o Units Mass% Mole fraction m (molality) All are temperature independent Today o Colligative properties Raoult’s Law Vapor pressure lowering Boiling point elevation Freezing point depression Raoult’s Law (for non-volatile solutes) o P soln = X 1 P 0 o P soln = vapor pressure of solution o X 1 = mole fraction of solvent o P 0 = vapor pressure of solvent o See A o See B illustration of the law o This law works well for dilute solutions. o The real behavior deviates from the law (See C)
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General Chemistry Lecture 102a In class notes for October 24, 2007 o Solute-solvent attractions vs. solvent-solvent attractions In positive deviation The solute-solvent attractions are weaker In negative deviation
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