65. What are the values of bond order belonging to , respectively?
(A) 1.5, 2.5
(B) 2.5, 1.5
(C) 2, 3
(D) 3, 2
(E) 2, 2

61. Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm = (A) 269.01860 cm (B) 269.0186 cm (C) 269.019 cm (D) 269.02 cm (E) 269.0 cm

62. Detection of radiation by a Geiger-Müller counter depends on ______. (A) the emission of a photon from an excited atom (B) the ability of an ionized gas to carry an electrical current (C) the emission of a photon of light by the radioactive particle (D) the ability of a photomultiplier tube to amplify the electrical signal from a phosphor (E) the detection of the sound made by decay particles

63. Please calculate the ΔS if ΔHvap is 66.8 kJ/mol, and the boiling point is 83.4°C at 1 atm, when the substance is vaporized at 1 atm. (A) -187 J/K mol (B) 187 J/K mol (C) 801 J/K mol (D) -801 J/K mol (E) 0

64. Which of the following values is based on the Third Law of Thermodynamics? (A) ΔH°f = 0 for Al(s) at 298 K (B) ΔG°f = 0 for H2(g) at 298 K (C) (D) qsys ＜ 0 for H2O(l) → H2O(s) at 0°C (E) None of these

66. The lattice energy of NaI(s) is -686 kJ/mol, and its heat of solution is -7.6 kJ/mol. Calculate the hydration of energy of NaI(s) in kJ/mol. (A) -678 (B) -694 (C) +678 (D) +694 (E) +15.2

67. According to molecular orbital, which of the following molecules is diamagnetic? (A) HF (B) O2 (C) NO (D) (E)

68. Consider the figure, which shows ΔG° for a chemical process plotted against absolute temperature. Which of the following is an incorrect conclusion, based on the information in the diagram? (A) ΔH° ＞ 0 (B) ΔS° ＞ 0 (C) The reaction is spontaneous at high temperatures. (D) ΔS° increases with temperature while ΔH° remains constant. (E) There exists a certain temperature at which ΔH° = TΔS°.

69. Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbonoxygen double bond. Calculate the enthalpy of reaction using the bond energies given.  (A) -484 kJ (B) -366 kJ (C) -48 kJ (D) +48 kJ (E) +366 kJ

70. How many of the following molecules exhibit resonance: , O2F2? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

71. One mole of X(g) and one mole of Y(g) are mixed in a closed reactor in the presence of catalysts, and Z(g) is generated. The reaction is a X + b Y → c Z, where a, b, and c are the coefficients in the balanced equation. At a certain time, the mixture contains 1.8 moles of gases while the ratio of their partial pressures is PX:PY:PZ = 7:9:2. What are the values of a, b, and c? (A) a = 1, b = 2, c = 3 (B) a = 3, b = 1, c = 2 (C) a = 7, b = 9, c = 2 (D) a = 3, b = 1, c = 8 (E) a = 2, b = 9, c = 7