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RelativeResourceManager4 - CHEM 6B PRACTICE EXAM 2-2 (Prof....

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Chem 6B Practice Exam 2-2 1 - B Prof. Crowell CHEM 6B PRACTICE EXAM 2-2 (Prof. Crowell) Spr 2010 May 4, 2010 *** FILL IN YOUR STUDENT ID NUMBER , NAME , and TEST FORM = B *** Bubble in the correct response on scantron (25 questions, worth 4 pts each) 1. Based on the phase diagram shown, which of the following statements are correct? 1. Sublimation occurs at a point along the straight line connecting point A to point H. 2. H vap can be measured at point F. 3. Points C and E represent points where the solid and gas phases are in equilibrium. 4. At point E the vapor pressure of the solid and liquid phases are in equilibrium. 5. The temperature at point B is called the critical temperature. *a) 2, 4 b) 1, 3, 5 c) 3, 4, 5 d) 1, 2, 3 e) 3, 4 2. Consider the following reaction CuSO 4 (s) CuO (s) + SO 3 (g) If G = 14.6 kJ at 1000 C for this reaction, calculate G for an SO 3 (g) pressure of 20 bar at this temperature. a) 15.9 kJ b) 45.1 kJ c) 14.6 kJ *d) 17.1 kJ e) 45.1 kJ 3. For each of the following groups of substances, pick the one that has the given property for each of the items (i), (ii), and (iii), respectively. (i) Lowest vapor pressure: CH 4 , CH 3 OH, C 2 H 4 . (ii) Greatest volatility (vapor pressure): CF 4 , CBr 4 , CCl 4 . (iii) Lowest boiling point: CH 3 (CH 2 ) 3 CH 3 , C(CH 3 ) 4 , (CH 3 ) 2 CHCH 2 CH 3 . a) CH 4 , CCl 4 , CH 3 (CH 2 ) 3 CH 3 b) CH 3 OH, CBr 4 , (CH 3 ) 2 CHCH 2 CH 3 c) CH 4 , CF 4 , C(CH 3 ) 4 *d) CH 3 OH, CF 4 , C(CH 3 ) 4 e) C 2 H 4 , CCl 4 , CH 3 (CH 2 ) 3 CH 3 4. Calculate the solubility (in moles/liter) of N 2 in water at a partial pressure of N 2 of 435 torr at 20 C. The Henry’s law constant for N 2 in water at 20 C is 7.0 x 10 -4 mol / liter - atm. a) 3.0 x 10 5 b) 1.0 x 10 -2 *c) 4.0 x 10 -4 d) 2.1 x 10 -4 e) 3.0 x 10 -1 5. The vapor pressure above a sugar-water solution at 25 C is 20.4 torr. What is the mole fraction of sugar in the solution? (Assume sugar is a nondissociated, nonvolatile solute and that the vapor pressure of water at 25 C is 23.8 torr). a)
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This note was uploaded on 12/16/2010 for the course CHEM 6B CHEM 6B taught by Professor Johncrowell during the Spring '09 term at UCSD.

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RelativeResourceManager4 - CHEM 6B PRACTICE EXAM 2-2 (Prof....

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