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

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.

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

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

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

83. Identify the missing particle in the following equation:(A) (B) (C) (D)(E) None of the above.

84. How many valence electrons are there in an atom with the electron configuration [noble gas]ns 2 (n – 1)d 10 np 3 ? (A) 2 (B) 3 (C) 5 (D) 10 (E) 15

85. For the process CHCl3(s) → CHCl3(l) , ΔH° = 9.19 kJ/mol and the melting point of chloroform is –64 °C. Calculate ΔS° ? (A) 43.9 J/mol/K (B) 53.9 J/mol/K (C) 26.3 J/mol/K (D) 75.2 J/mol/K (E) None of the above.