21. Which of the following statements is correct?
(A)For 2H₂(g) + O₂(g) → 2H₂O(l), its  is larger than 0 (> 0)
(B)The S^o of C₂H₅OH(l) is larger than the S^o of C₂H₅OH(g)
(C)One mol N₂ (at STP) has more positional probability than 1 mol N₂ at 100 K, 2.0 atm.
(D) The sign of  for the process of H₂O(l) → H₂O(g) is positive (+).
(E)At constant T and P, the change with  is not a spontaneous process.

17. What is the osmotic pressure of an aqueous solution containing 1.0 g/L of a protein (molar mass = 9.0 × 104 g/mole) and its density of the solution being 1.0 g/cm3 at 25℃? (R = 0.08206 L*atm*mol-1*K-1) (A)0.200 torr(B)0.030 torr(C)0.003 torr (D) 0.400 torr (E)0.0003 torr

18. You have 75.0 mL of 0.10 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH of the HA-NaOH solution is 5.50. What is the Ka value of HA? (A)1.74 × 10-8(B)2.1 × 10-6(C)6.0 × 10-5 (D) 5.6 × 10-4 (E)6.6 × 10-7

19. Kf for the complex ion Ag(NH3)2 + is 1.7 × 107 . Ksp for AgCl is 1.6 × 10-10. Calculate the molar solubility of AgCl (in mol/L) in 1.0 M NH3. (A)1.5 × 10-4(B)1.5 × 10-3- (C)1.5 × 10-2 (D) 4.7 × 10-2 (E)4.7 × 10-3

20. What is the  for H2O(g) + (1/2)O2(g) ←→ H2O2(g) at 600. K using the following data: H2(g) + O2(g) ←→ H2O2(g) K = 2.3 × 106 at 600. K 2H2(g) + O2(g) ←→ 2H2O(g) K = 1.8 × 1037 at 600. K? (A)-7.1 × 104 J/mol(B)1.4 × 105 J/mol(C)1.1 × 105 J/mol (D) 7.9 × 103 J/mol (E)1.0 × 103 J/mol

22. An electrochemical cell consists of a standard hydrogen electrode and a copper metal electrode. What is the potential of the cell at 25℃ if the copper electrode is placed in a solution in which [Cu2+] = 2.5 × 10-4 M. [Note: Cu2+(aq) + 2e- → Cu(s), E0 = 0.34 V] (A)0.23 V(B)-0.16 V(C)0.018 V (D) 0.26 V (E)0.059 V

23. Which of the following compound is not going to dissolve in carbon tetrachloride? (A)CO2(B)CH2=CH2(C)NH4NO3 (D) KrF2 (E)C6H14 (Hexane)

24. Phosphorus-32 (P-32) is a commonly used radioactive nuclide in biochemical research, particularly in studies of nucleic acids. The half-life of P-32 is 14.3 days. What mass of P-32 is left from an original sample of 175 mg of Na3 32PO4 after 35.0 days? Assume the atomic mass of 32-P is 32.0. (A)6.22 mg(B)62.20 mg(C)0.12 mg (D) 1.24 mg (E)12.44 mg

25. Which of the following statements is correct? (A)The low-spin Ru(NH3)6 2+ ion has 4 unpaired electrons.(B)The Ni(H2O)6 2+ ion has 0 unpaired electrons. (C)The diamagnetic PdCl4 2- ion has a tetrahedral d8 structure. (D) CN- is a weaker field ligand than SCN-1 because the Fe(CN)6 3- ion is paramagnetic with one unpaired electron and the Fe(SCN)6 3- ion has five unpaired electrons. (E)The F- ligand in the CrF6 4- ion produces a weak field because the ion is known to have four unpaired electrons.

Part I. Vocabulary: Choose the answer that best completes the sentence. 30% 1. Because the girl was crippled, she was _____ to a wheelchair. She had so much difficulty going outdoors. (A) confined (B) condensed (C) conducted (D) consisted

2. Head delegations from the countries are now at the negotiation tables in the first round of _____ talks, the results of which are hoped to be the beginning of improved relations between the two nations. (A) bicameral (B) bifocal (C) binomial (D) bilateral