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 ofbenzene, C6H6(C)' to CO 2(g) and H 20(C). a) -587 kJ b) -1174kJ c) -3267kJ d) -1553 kJ e) -1455 kJ 3. Ifthe heat ofvaporization for a particular metal is 297.0 kJ / mol and the heat 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 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 b) 614 kJ I c) 517kJ/mol d) 586 kJ I e) None ofthese is correct. 5. The solubility ofwhich ofthe following salts would be affected the most by the addition ofnitric acid? a) AgI b) AgCf c) AgBr e) AgCe0 4 6. The Ksp ofAgI (MW == 234.8 g I mol) is 1.5 x 10- 16 What is the solubility ofAgI in g in 250.0 mL of 0.250 M NaI solution? a) 1.4 x 10- 13 g b) 3.5 X 10- 14 g c) 7.2 X 7 g 13 d) 5.6 X g e) None of these is correct.
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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) a) No, because the ion product is greater than Ksp. b) Yes, because the ion product is less than Ksp. c) No, because the ion product is less than Ksp. d) Yes, because the ion product is greater than Ksp. e) Not enough information is given. 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 ofthe 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? a) -499 kJ b) -166 kJ c) 166 d) -364 e) None ofthere is correct. 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 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 ) a) 6.1 x lO- i oM b) 6.0 x 10- 6 M c) 3.6 X 1O- 1i M d) 3.7 X 15 M of these is correct.
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13. What is molar solubility ofthallium 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 2 M e) 7.1 x 10- 2 M 14. A 25.0 g piece of aluminum, which has a molar heat capacity of 24.03 J / mol· DC, is heated to 82.4 °c and dropped into a calorimeter containing water, specific heat capacity of 4.184 J / g . DC, initially at 22.3 DC. The final temperature ofthe water is 24.9 dc. What was the mass of water in the calorimeter? a) 118 g b) 6.57 g c) 3180 g d) 2120 g e) 318 g 15.
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This note was uploaded on 10/06/2011 for the course CHM 112 taught by Professor Thomasberg during the Fall '11 term at FIU.

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

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