CHEM 6B midterm solutions 2

CHEM 6B midterm solutions 2 - Chemistry 68: General...

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Unformatted text preview: Chemistry 68: General Chemistry 1 Uli Muller University of California, San Diego, Winter 2010 Second Midterm exam - 18 February 2010 maximum score: 42 points Student name (print): ___ _ Student 10: ________________ If you have a question, quietly raise your hand and wait until a TA is at your place. If you need more space, continue to write on the back of the paper. Student name (print): ____ ____ _____ Problem 3 (6 points): You are measuring the osmotic pressure of a solution of sodium chloride, at 25C. The osmometer shows a height difference of 0.51 m between both sides of the semipermeable membrane. What is the molar concentration of sodium chloride? (j) . (j) _ /.!) :: !1.CD:> k ]) 11=- 2'S:- Ill., I R-IC 1-l. W J ",,3 \V IT = cr.rsl ;, . {pro . 0. 51 "" = 5 CO:!> :. CD (YI 1.0 I fV' H (j) C -:: , ,01 2 . ;;:e (j) Problem 4 (5 points): You mix water with methanol and notice that the mixture warms up. Draw a composition - boiling temperature diagram and explain why your diagram shows a specific curvature....
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CHEM 6B midterm solutions 2 - Chemistry 68: General...

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