8. The decomposition of ethanol (C₂H₅OH) on an alumina (Al₂O₃) surface, C₂H₅OH(g) → C₂H₄(g) + H₂O(g), was studied at 600 K. Concentration versus time data were collected for this reaction, and the plot of [A] versus time resulted in a straight line with a slope of -4.00 × mol/L*s. If the initial concentration of ethanol was 1.25 × M, the time required to decompose all ethanol was .
(A)5.22 min
(B)313 min
(C)156 min
(D) 31.3 min
(E)0.26 min

4. Which of the following gases would you expect to have the smallest value of of the van der Waals constant b: H2, N2, CH4, C2H6, C3H8?. (A)H2(B)N2(C)CH4 (D) C2H6 (E)C3H8

5. Which one of the following statements is incorrect? (A)At constant temperature, the lighter the gas molecules, the faster the average velocity of the gas molecules. (B) A real gas behave most ideally when the container volume is relatively large and the gas molecules are moving relatively quickly. (C) For a 1.0-L container of neon gas at STP, its average velocity will increase when the volume of the container is decreased to 0.5 L. (D) At constant V and T, when gas added into the container, the number of collision per unit area increases to result in a higher pressure. (E)For a 1.0-L container of neon gas at STP, its kinetic energy will increase when its temperature is increased to 100℃.

6. A 12.6-g sample of acetylene (C2H2) produced a temperature increase of 16.9℃ in a bomb calorimeter (heat capacity = 31.5 kJ/℃). The energy of combustion for acetylene is thus kJ/mol. (A)532(B)1100(C)-1100 (D) -532 (E)3830

7. A certain reaction has an activation energy of 54.0 kJ/mol. As the temperature is increased from 22℃to a higher temperature, the rate constant increases by a factor of 7.00. The indicated higher temperature is K. (A)335(B)289(C)324 (D) 340 (E)351

9. For the reaction PCl5(g) PCl3(g) + Cl2(g) at 327℃, the equilibrium constant, Kp, is 11.5. Suppose that 2.450 g PCl5 is placed in an evacuated 500-mL bulb, which is then heated to 327℃. The partial pressure of PCl3 at equilibrium is atm. (A)0.1(B)2.22(C)1.06 (D) 0.38 (E)4.80

10. Which of the following 0.10 M solutions are correctly arranged in order of the strongest acidic to the weakest acid? (Ka of HNO2 = 4.0 × 10-4; Kb of HONH2 = 1.1 × 10-8) (A)HClO4 > HNO2 > CaBr2 > KNO2 > HONH3ClO4(B)HNO2 > HClO4 > CaBr2 > HONH3ClO4 > KNO2 (C) HONH3ClO4 > HClO4 > HNO2 > CaBr2 > KNO2 (D) HClO4 > HNO2 > HONH3ClO4 > CaBr2 > KNO2 (E)KNO2 > HClO4 > HNO2 > CaBr2 > HONH3ClO4

11. The pH of a 0.05 M solution of trichloroacetic acid (CCl3CO2H), a corrosive acid used to precipitate proteins, has the same pH as a 0.04 M HClO4 solution. The Ka for trichloroacetic acid is thus . (A)4.0 × 10-8(B)1.6 × 10-5(C)0.16 (D) 1.4 × 10-14 (E)0.001

12. Which of the following statements is correct? (A)Carbon has electron affinity more favorable (exothermic) than nitrogen(B)H has the radius smaller than He (C) For Te, S, and Se, the order of increasing atomic size is Se < S < Te (D) Among Nb, Zn, and Si, Zn has the smallest radius (E)Among Cl, In, and Se, In has the smallest radius

13. In the ground state of mercury, Hg, (A)its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2 4d10 (B)it has 16 electrons occupying atomic orbitals with n = 3(C)it has 30 electrons in d atomic orbitals (D) it has 10 electrons in px atomic orbitals (E)it has 31 electrons with ‘spin’ up (ms = 1/2)

14. LiI(s) has a heat of formation of -292 kJ/mol and a lattice energy of -753 kJ/mol. The ionization energy of Li(g) is 520 kJ/mol, the bond energy of I2(g) is 151 kJ/mol, and the electron affinity of I(g) is -295 kJ/mol. Use these data to determine the heat of sublimation of Li(s) to be . (A)411 kJ(B)-411 kJ(C)109 kJ (D) -109 kJ (E)161 kJ