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Spring+2008+1332+Final - 1332 SPRING 2008 FINAL EXAM NO...

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1332 SPRING 2008 FINAL EXAM NO CHEATING 1. Of the gases, Ne, N 2 , O 2 , CH 4 and SiH 4 , which one would you expect to be easiest to liquefy? (A) Ne (B) N 2 (C) O 2 (D) CH 4 (E) SiH 4 2. What is the amount of heat absorbed by 10.0 grams of ice at -150 o C in coverting it to liquid water at 50.0 o C. (specific heat of H 2 O(s) = 2.09 J/g o C, specific heat of H 2 O(l) = 4.18 J/g o C, heat of fusion of H 2 O(s) = 333 J/g) (A) 5.73 x 10 3 J (B) 6.76 x 10 2 J (C) 1.70 x 10 2 J (D) 2.83 x 10 3 J (E) 3.29 x 10 3 J 3. What mass in grams of a molecular substance (molar mass = 50.0 g/mol) must be added to 500 g of water to produce a solution that boils at 101.54 o C? (K bp = 0.512 o C/m for water.) 4. Which of the following would have a boiling point closest to that of 1 m NaCl? 5. 8.60 g of a protein was dissolved in enough water to produce 75.0 mL of solution. If this solution has an osmotic pressure of 0.959 atm at 25.0 °C, what is the molar mass of the protein in g/mol? 6. The decomposition of dinitrogen pentoxide, 2N 2 O 5 (g) → 4NO 2 (g) + O 2 (g), is first order with a rate constant of 5.1 x 10 -4 s -1 at 45 o C. How long will it take to convert 7/8 of the starting material? (A) 1.3 x 10 3 s (B) 32 min (C) 2.7 x 10 2 s (D) 4.1 x 10 3 s (E) 44 min
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7. What is the rate law for the reaction CO(g) + Cl 2 (g) → COCl 2 (g) given the following data obtained at a certain temperature for this reaction. [CO] t=0 (M) [Cl 2 ] t=0 (M) Initial Rate (M/s) 1.00 0.100 1.29 x 10 -29 0.100 0.100 1.33 x 10 -30 0.100 1.00 1.30 x 10 -29 0.100 0.0100 1.32 x 10 -31 8. If the activation energy of a certain reaction is 50 kJ/mole by what factor does the rate constant increase when the temperature is raised from 25 o C to 300 o C? 9. Which of the following mechanisms is consistent with the observed rate law, rate = k[H 2 ][Br] 1/2 , for the reaction H 2 (g) + Br 2 (g) → 2HBr(g)?
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