e2_132_f09 - Exam 2, CHE 132 Fall 2009 Multiple Choice, 5...

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Exam 2, CHE 132 Fall 2009 Multiple Choice, 5 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. How many grams of sucrose (C 12 H 22 O 11 ) must be added to 552 g of water to give a solution with a vapor pressure 2.0 mm Hg less than that of pure water at 20 °C? The vapor pressure of pure water at that temperature is 17.5 mm Hg. M(H 2 O) = 18.0153 g mol –1 M(C 12 H 22 O 11 ) = 342.29648 g mol –1 A. 1048 g B. 71.23 g C. 1353 g D. 213.7 g E. 1198 g ____ 2. In a basic solution at 25 C, A. [H 3 O + ] > 1.0 10 7 . B. [H 3 O + ] > [OH ]. C. [OH ] > 1.0 10 7 . D. [H 3 O + ][OH ] > 1.0 10 14 . E. [H 3 O + ][OH ] < 1.0 10 14 . ____ 3. At 450 °C the equilibrium constant K c for the reaction 3 H 2 (g) + N 2 (g) 2 NH 3 (g) is 0.16. If a vessel contains a reaction mixture in which [N 2 ] 0 = 0.001 mol L –1 , [H 2 ] 0 = 0.025 mol L –1 , and [NH 3 ] 0 = 0.0015 mol L –1 , which one of the following statements is correct? A. More ammonia will be formed B. Hydrogen will be consumed C. Nitrogen will be produced D. Nothing happens E. Both nitrogen and ammonia will be consumed
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____ 4. For benzoic acid ΔH°(fusion) = 18.02 kJ mol –1 and ΔS°(fusion) = 45.56 J K –1 mol –1 . What is the melting temperature of benzoic acid? A. 273.4 K B. 2255 °C C. 122.5 °C D. 273.15 K E. 275.5 °C ____ 5. 1,2-diaminoethane, H 2 NCH 2 CH 2 NH 2 , behaves in water as a base capable of adding up to two protons, forming the species (H 2 NCH 2 CH 2 NH 3 ) + with pK b1 = 3.29 and the species
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e2_132_f09 - Exam 2, CHE 132 Fall 2009 Multiple Choice, 5...

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