14. Given the thermochemical data:

What is the △H° for the reaction: 2 CH₄→ C₂H₄ +2 H₂?
(A) a/2-d+ b/2
(B)-a+b + 2c + d/2
(C) 2b-d/2-a/2-c
(D) a-b+2c + d
(E) b+d-a-2c

15. Many organic compounds containing thiol groups (-SH) are antidotes for the heavy metal element mercury poisoning. For example, the antidote compound I produces compound II with mercuric oxide as shown below.Compound III is also a mercury detoxifier. Compound IV is a strong acid. Which of the following statements is correct? (A) In compound I, the S atoms take on sp hybridization. (B) The electronegativity of the S element is the greatest in compound II. (C) the C-C-C bond angle is 180° in compound III. (D) There are ionic and covalent bonds in compound III. (E) The bond energies of the sulfur-oxygen bonds are equal in compound IV.

16. Compound Y has antimicrobial and anti-inflammatory properties and can be produced from X.  Which of the following statements about compounds X and Y is correct? (A) 1 mol of X reacts with a maximum of 2 mol of NaOH. (B) X can be obtained by esterification of Y with ethanol. (C) X and Y both react with acidic KMnO4 solution. (D) At room temperature, X and Y react with sufficient amounts of Br2 to produce products containing different numbers of chiral centers. (E) All C and O atoms in both X and Y are coplanar.

17. Which of the following is a chiral compound? (A)①(B)②(C)③(D)④(E)⑤

18. A compound formed by Ni and Al may form a structure with the unit cell shown on the right. Based on the provided information, which of the following statements is incorrect?(A) This compound is an ionic solid. (B) Each Ni atom is surrounded by 4 Al atoms. (C) Each Al atom is surrounded by 12 Ni atoms. (D) Each unit cell contains 1 Al atom. (E) This compound has a higher melting point than aluminum metal OAl Ni NTHU115

19. Which of the following pairs of compounds have identical normal boiling point?

20. What is the approximate lifting power of 16 g of helium in the atmosphere at 1 atm and 25 °C? (A) 13 g (B) 40 g (C) 80 g (D) 100 g (E) 120 g

21. At room temperature, 0.10 M NaOH solution is added dropwise to 20 mL of 0.10 M CH3COOH solution. The relationship between the negative logarithm of the H+ concentration originating from the autoionization of 5- water, -log[H+]water, and the volume of 10 20 30 40 VNOH(ag/nL NaOH solution added is shown in the graph on the right. Assuming that the volume change upon mixing can be neglected, which of the following statements is correct? (A) At point b, [CH3COO-] ＜ [CH3COOH]. (B) At points c and e, the solutions are both neutral. (C) At point d, the concentration of CH3COO- is greater than that at point e. (D) At point d, [CH3COO-] + [CH3COOH] = 0.05 M. (E) At point f, [Na+] ＞ [CH3COO-]＜[OH-]>[ H+].

22. A 0.10 M solution of the salt BHA has a pH of 6.5 at 25 °C, where B is a weak base and A- is the conjugated base of the weak acid HA. Given that the Kb value for B is 1.0 x 10-6, what is the Ka value for HА? (A) 1.0 x 10-6 (B) 2.0 x 10-6 (C) 1.0 x 10-8 (D) 1.0 x 10-5 (E) 2.0 x 10-5 

23. The nuclide decays by B-emisson with a half-life of 37.2 min. A sample of0.80 mol of H38Cl is placed in a 11.0 L closed container at 300 K, where one of the decay products is H2(g). What is the pressure (atm) in the container after 74.4 min? (R=0.082 atm-L.mol-¹.K-¹) (A) 1.23 (B) 1.79 (C) 2.24 (D) 2.46 (E) 3.13

24. Monosaccharides can be presented in both Haworth and Fischer projection. Which of the following pairs represents the same manosaccharide?

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