chem1A-fall03-mt3-Head_Gordon-soln

chem1A-fall03-mt3-Head_Gordon-soln - KEY Chemistry 1A,...

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Page 1 KEY Chemistry 1A, Fall2003 Midterm Exam III, Version A November 13, 2003 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ Write your name on every page of this exam. This exam is multiple choice. Fill in the Scantron form AND circle your answer on the exam. There are 40 multiple choice questions. 3.75 points each The questions can be worked in any order. Do those that you can do quickly first, then work the other questions.
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Page 2 Potentially useful relations: 800 600 400 200 IR Visible UV Wavelength (nm) Color and Wavelength of Light compound G° (kJ / mol) CO 2 -394.36 H 2 O (g) -228.57 C 6 H 12 O 6 -910 O 2 0 G° of Formation N 0 = 6.02214 x 10 23 mol -1 R = 2.179874 x 10 -18 J R = 3.28984 x 10 15 Hz k = 1.38066 x 10 -23 J K -1 h = 6.62608 x 10 -34 J s m e = 9.101939 x 10 -31 kg c = 2.99792 x 10 8 m s -1 Gas Constant: R = 8.31451 J K -1 mol -1 R = 8.20578 x 10 -2 L atm K -1 mol -1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C 1 nm = 10 -9 m 1 kJ = 1000 J Cp(H 2 O) = 4.184J/g K G ° = H ° - T S ° H ° = Σ H ° f (products) - Σ H ° f (reactants) S ° = Σ S ° (products) - Σ S ° (reactants) G ° = Σ G ° f (products) - Σ G ° f (reactants) S = k B lnW for aA + bB cC + dD b a d c B A D C Q ] [ ] [ ] [ ] [ = At equilibrium, Q = K G ° = - RTln K R S T R H K ° + ° = 1 ln G ° = - nF Є º pX = - log X ] [ ] [ log HA A pK pH a + = E = h ν λν = c λ deBroglie = h / p = h / mv p = mv E kin = ½ mv 2 E kin (e-) = h ν - Φ = h ν - h ν 0 = R n Z E n 2 2 PV = nRT RT E kin 2 3 = M 3RT v rms = E = q + w w = - P ext V T nR E = 2 3
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Name_________________________ Page 3 S ECTION 1: E QUILIBRIUM For questions 1 – 11 consider the following three reactions at 298 K. I. 2 SO 3 (g) 3 O 2 (g) + 2 S (s) K = 0.225 H ˚ =+ 791 kJ II. S (s) + O 2 (g) SO 2 (g) K = 225 H ˚ = -270 kJ III. 2 SO 3 (g) O 2 (g) + 2 SO 2 (g) 1.) What is the equilibrium constant for a mixture of O 2 , SO 3 and SO 2 gas (rxn. III )? A) 75.5 B) 112 C) 1.1 x 10 4 D) 2.5 x 10 -5 E) 0.775 2.) What is the value of the equilibrium constant for rxn I if at equilibrium the flask contains 0.236 atm SO 3 , 0.500 atm O 2 , and 0.01 g Sulfur after a temperature change. A) 0.0909 B) 11.0 C) 1.63 x 10 -5 D) 6.25 x 10 -2 E) 3.) .What change has occurred if the value of K for rxn I is found to be 0.552? A) B) A decrease in temperature. C) An increase in pressure. D) An increase in volume. E) cannot be determined. 4.) Which is a suitable expression for the reaction quotient for the formation of SO 2 from the elements?
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This note was uploaded on 02/08/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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chem1A-fall03-mt3-Head_Gordon-soln - KEY Chemistry 1A,...

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