76. Consider the following reaction:. The equilibrium constant K is about 0.0196 at 115 °C. Calculate K_p at this temperature?
(A) 0.196
(B) 0.624
(C) 0.285
(D) 22.9
(E) 2.9

72. Which of the following molecules is an optically active molecule? (A) (B) (C) (D) (E) None of the above.

73. The structure below is the repeating unit of a (A) homopolymer formed by an addition reaction. (B) homopolymer formed by a condensation reaction. (C) copolymer formed by an addition reaction. (D) copolymer formed by a condensation reaction. (E) polyester formed by an addition reaction.

74. Identify the products of the reaction of 3-octene with chlorine. (A) (B) (C) (D) (E)

75. Which of the following statements about molecular spectroscopies is incorrect? (A) Ultraviolet-visible (UV-vis) spectra provides information about HOMO-LUMO gap. (B) Infrared (IR) spectra gives information on bond vibrational transitions. (C) Rotation transitions occur in the microwave region. (D) Nuclear magnetic resonance (NMR) spectra provides information about the electronic transitions. (E) UV-vis spectra involves both the molecular ground state and the excited state.

77. The equilibrium constant for reaction (A) K 4 (B) 4K (C) 1/4 K (D) 1/K4 (E) - K 4 

78. The pH of a 0.005 M K2O aqueous solution should be ________. (A) 11.7 (B) 7.0 (C) 2.3 (D) 12.0 (E) 5.0

79. How long will it take to produce 18.2 g of Ag (atomic mass = 107.87 amu) from a solution of AgNO3 using a current of 10.00 amp? (F = 96500 C/mol) (A) 3.26✖103 s (B) 8.14✖102 s (C) 4.88✖103 s (D) 1.63✖103 s (E) 5.43✖103 s

80. Given Cu2O(s) + 1/2O2(g) → 2CuO(s) , ΔH° = −144 kJ and Cu2O(s) → Cu(s) + CuO(s) , ΔH° = +11 kJ Calculate the standard enthalpy of formation of CuO(s) . (A) −155 kJ (B) +299 kJ (C) +155 kJ (D) −299 kJ (E) −166 kJ

81. Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous.   Overall reaction: MnO4–(aq) + 2H2O(l) + 3Co2+ (aq)MnO2(s) + 3Co3+(aq) + 4OH– (aq) (A) E°cell = –1.23 V, spontaneous (B) E°cell = –1.23 V, nonspontaneous (C) E°cell = 1.23 V, spontaneous (D) E°cell = 1.23 V, nonspontaneous (E) E°cell = –0.05 V, nonspontaneous

 82. The successive packing pattern for a hexagonal closest packed structures is which of the following? (A) ABCABC (B) ABCCBA (C) ABABAB (D) ABAABA (E) AABBAA