In class notes for October 29, 2007

In class notes for October 29, 2007 - The testbook pages...

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General Chemistry Lecture 102a In class notes for October 29, 2007 Last Lecture o Osmosis and Freezing point depression Today o One more osmosis example o Henry’s Law o Distillation How tall can a tree be assuming osmosis is the major factor in getting fluids distributed through the tree? o Sap- about 15g sugar (sucrose) per 100mL o . = . 15g1 mol sug358 3g 0 0419 mol sugar o = = . . = . C nv 0 0419 mol sug0 10 L 0 419 M o = = . . = . π cRT 0 419 mol x 0 082057 x 298 10 24 atm o = π gdh *remember pressure must be in pascals* o . . 10 24 atm 1 013 x 106 pascals1 atm = 1.037 x 10 6 o = π gdh o = h πgd o = . = . assume d 1 5gL 1 15kgL o = . . . / = . h 1 037 x106kgms29 8msx 1 5 kg L 1 00 x 105Lm2x1000mLL = x1cm3mLx1m100cm 100m o . = 100m1ft0 3048m 328ft o Clicker Question Assume the information is the solute and htat your brains and the textbook pages are the solvent. If your skull is a semipermiable membrane what is likely to happen if you fall asleep on the test (assume your brains contain less knowledge than the book)? Information will flow from the text to your brain
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Unformatted text preview: The testbook pages will ooze into your brains Your brains will ooze out onto the book What little information you did have in your brain will flow out into the book General Chemistry Lecture 102a In class notes for October 29, 2007 o Volatile solute See A Henrys Law (often used for gases dissolved in liquids) P solute = k h X solute K h = Henrys Law constant o Unique for each solvent-solute combination o Distillation Separation of two volatile liquids 50/50 mixture of ether and chloroform (by mol) P ether = 200 torr P CHCl3 = 60 torr P ether =X e P e = 0.5 x 200 torr = 100 torr P CHCl3 = 0.5 x 60 torr = 30 torr P tot = 100 torr + 30 torr = 130 torr Vapor phase X e = 100 torr130 torr = 0.77 Vapor phase X CHCl3 = = . 30 torr130 torr 0 23 Vapor is more concentrated in more volatile component of mixture. Take vapor, liquify then evaporate. o...
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In class notes for October 29, 2007 - The testbook pages...

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