CHM 112 Exam 1 Spring 2010 Berg

CHM 112 Exam 1 Spring 2010 Berg - CHEM 112 Exam 1 Spring...

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----- CHEM 112 Exam 1 Spring 2010 NAME: Dr. Thomas Berg Total Points == 150 Questions 1-30 : 5 points each USEFUL INFORMATION: R = 8.314 J. mor l K- 1 .6.E= q+w
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1. Which if the correct mathematical expression for the molar solubility (S) of MgC 2 0 4 ? b) 4 S3 c) 7 S2 d) S7 e) 27 S4 2. Consider the following data: ~Hf· CO 2 (g) == -393.5 kJ ~Hf· H 2 0([) == -285.8 kJ Calculate the standard enthalpy change for the combustion of 1.000 mole of benzene, C6H6(C)' to CO 2 (g) and H 2 0(C). a) -587 kJ b) -1174kJ c) -3267kJ d) -1553 kJ e) -1455 kJ 3. If the heat of vaporization for a particular metal is 297.0 kJ / mol and the heat of sublimation for the metal is 415.8 kJ / mol, what is the heat of crystallization for that same metal? a) -118.8 kJ / mol b) 118.8 kJ / mol c) 712.8 kJ I mol d) -712.8 kJ / mol e) None of these is correct.
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4. Consider the fluorination of acetylene, C 2 H 2 : tl.H" = -1227 kJ Bond D. kJ I mol C-H 413 H-H 432 F-F 159 C-F 453 C-C 347 Estimate the value for the C-to-C triple bond dissociation energy. a) 344 kJ I mol b) 614 kJ I mol c) 517kJ/mol d) 586 kJ I mol e) None of these is correct. 5. The solubility of which ofthe following salts would be affected the most by the addition of nitric acid? 6. The Ksp of AgI (MW == 234.8 g I mol) is 1.5 x 10- 16 What is the solubility of AgI in g in 250.0 mL of 0.250 M NaI solution? 10- 13
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7. If 35.0 mL of 5.5 x 10'5 M AgN0 3 are added to 70.0 mL of2.0 x 10'3 M K 2 C0 3 , will a precipitate occur? (Ksp of Ag2C03 = 8.1 x 10,12) 8. At constant pressure, the combustion of 11.3 g of C2H6 releases 585 kJ of heat. What is L'lH for the reaction shown below (as written)? 2 C2H 6 (g) + 7 02(g) -+ 4 C02(g) + 6 H20CI:) a) -1.56 x 10 3 kJ / rxn b) -51.8 kJ / rxn c) -3.l1 x 10 3 kJ I rxn d) -6.61 x 10 3 kJ / rxn e) None of these is correct. 9. How many of the following should have their standard heat of formation, L'lH o f, to be zero at 25°C? O(g) 02(g) 02(C) 03(g) a) 0 b) 1 c) 2 d) 3 e) 4
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10. Consider the following data: What is ilH c for the reaction below? 1 L What is the pH of a saturated solution ofBa(OH)2 ifthe Ksp is 5.0 x 1O- 3 ? a) 7.34 b) 13.03 c) 13.33 d) 12.85 e) None of these is correct. 12. A solution consists of 0.50 M Mg.2+ and 0.020 M Cu-"+. A solution ofNaOH is added slowly without changing the volume. What is the concentration of Cu~+ ion when Mg(OH)::. just begins to precipitate? (Ksp = 1.8 x 10- 11 for Mg(OH)2 and Ksp = 2.2 x 10- 20 for CU(OH)2 )
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13. What is molar solubility of thallium chloride in 0.30 M NaCe at 25°C? Ksp for TlC( is 1.7 x 10- 4 . a) 5.1 x 10- 5 M b) 5.7 X 10- 4 M c) 7.1 X 10-3 M d) 1.3 X 10- 2 M e) 7.1 x 10- 2 M
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