10. Calculate the pH of the solution in Problem 9 after adding 50.0 mL (total) KOH.
(A) 4.5
(B) 6.0
(C) 5.5
(D) 5.0
(E) 6.5

11. Calculate the bond energy of F2- (in kJ/mol) by using the following data: ionization energy ofF2-(290 kJ/mol), ionization energy of F-(327.8 kJ/mol), and bond energy of F2 (154 kJ/mol). (A) 77 (B) 86 (C) 98 (D) 107 (E) 116

12. Arrange the following species in order of the shortest to the longest N-O bond:(1)H2NOH, (2)N2O, (3)NO⁺, (4)NO2-, (5)NO3-.(A) 3, 2, 4, 5, 1 (B) 4, 2, 3, 5, 1 (C) 2, 3, 4, 1, 5 (D) 1, 5, 4, 2, 3 (E) 2, 3, 4, 5, 1

13. A certain substance, X, has a triple-point temperature of 20°C at a pressure of 2.0 atm. Which one of the following statements cannot possibly be true? (A) X can exist as a liquid above 20°C. (B) X can exist as a solid above 20°C. (C) Liquid X can exist as a stable phase at 25°C, 1 atm. (D) Both liquid and solid X have the same vapor pressure at 20°C. (E) All of these statements could be true.

14. The temperature at some planet is so high that the electronic ground state of the hydrogen atom is at n = 4. What's the ionization energy of the hydrogen atom at that planet if that in the Earth is equal to E? (A) E/4 (B) 4E (C) E/16 (D) 15E/16 (E) 16E

15. Arrange the elements C, N, and O in order of increasing ionization energy. (A) C, N, O (B) O, N, C (C) C, O, N (D) N, O, C (E) none of these

16. 1.0 mole monatomic ideal gas at 300 K and 10.0 atm is expanded adiabatically and reversibly to 1.0 atm. Calculate the final volume (in L). (A) 5.2 (B) 13.5 (C) 7.6 (D) 9.8 (E) 11.2

17. What's the work (in R) in Problem 16? (A) -210 (B) -270 (C) -360 (D) -320 (E) -440

18. A certain reaction has the following general form: a A → bB.At a particular temperature and [A]o= 2.50 x 10-3 M, a plot of 1/[A] vs. time resulted in a straight line with a slope of 4.0 x 10-2 L/mol,s. What's the "third" half-life (in 104 s)? (A) 5.0 (B) 1.0 (C) 2.0 (D) 6.0 (E) 4.0

19. The reaction 2 NO(g) + O2(g) → 2 NO2(g) is believed to take place bythe following mechanism:(1) NO + NO⇌ N2O2  (rate constant: kı and k-1, fast)(2) O2 + N2O2 → 2 NO2 (rate constant k2, slow)What's d[NO2]/dt under the condition k-1 ＞＞ k2[O2]? (A) k-1k2[NO]2[O2]/k1 (B) k-1k2[NO][O2]/k1 (C) 2k1k2[NO]²[O2]/k-1 (D) k-1k2[NO]²/kı (E) k1k2[NO]²[O2]/k-1

20. Consider the reaction 3A+B+CD + E, where the rate law is defined as-d[A]dt =(1.66x102 L³/mol³ s)[A]²[B][C]An experiment is carried out where [B]0 =2.0 M, [C]0 = 1.0 M and [A]0 = 2.5 x10-4 М. What's the concentration (in 10-5 M) of A after 5.0 minutes? (A) 7.2 (B) 8.7 (C) 6.5 (D) 4.2 (E) 1.3

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