14. Decomposition of 2.76 g M₂CO₃ yields 1.88 g M₂O. What is the atomic mass of M?
(A) 9
(B) 23
(C) 39
(D) 85

15. For a triprotic acid H3A with pK1 = 3.0, pK2 = 6.0 and pK3 = 9.0, which of the following relations is correct? (A) [H3A] = [A3- ] at pH = 7.0 (B) [HA2- ]/[A3- ] = 10 at pH 7.0 (C) [H2A- ] ＞ [HA2- ] at pH 6.5 (D) [H3A] ＞ [HA2- ] at pH 5.0 3

16. Which of the following statements is correct? (A) a saturated solution contains a high concentration of solute. (B) the solubility of solids always increases with temperature. (C) a saturated solution involves a dynamic equilibrium between the solid and its solution. (D) a supersaturated solution involves a dynamic equilibrium between the solid and its solution.

17. Which operation will increase the quantity of product for the exothermic reaction:2SO2(g) + O2(g)2SO3(g) (A) a decrease in volume of container (B) an increase in temperature (C) increasing P by adding some argon (D) adding a catalyst

18. Consider the equilibrium: PCl5(g) PCl3(g) + Cl2(g), Kc = 0.025 at 400 K. If 0.5 mol of PCl5 is placed in a 1.0 L container at 400 K and is allowed to reach equilibrium, what is the total pressure (in atm) of the gases? (A) 5 (B) 10 (C) 15 (D) 20

19. For an ideal gas, which of the following sets of variables has a linear relationship? (A) P vs. 1/V (B) V vs. T (C) PV vs. T (D) P/T vs. density

20. It took 2 min for 0.20 L of H2 to effuse through a pin hole. How long will it take (in min) for 0.10 L of O2 to effuse under identical conditions? (A) 2 (B) 4 (C) 8 (D) 16

複選題21. A certain liquid (X) has a normal boiling point of 353 K. The densities (in g/L) of the vapor X in equilibrium with its liquid at 300 K and 353 K are 0.50 and 2.7, respectively. Assume the vapor behaves ideally, answer the following questions. (A) Find the molar mass of X.   3% (B) Find the vapor pressure of liquid X at 300 K.   2% (C) If the saturated vapor of X at 353 K in a 2.0 L glass flask is cooled to 300 K, what is the mass of X that the will be condensed?   2% (D) If X is a hydrocarbon containing 92.3% carbon, what are the empirical formula and molecular formula of X?   3%

複選題22. A battery is constructed from two half cells: Zn|Zn2+(1.0 M) and Mn|Mn2+(1.0 M)； the volume of each electrolyte solution is 300 mL. The battery is allowed to discharge at a constant current of 9.65 amperes. Given that: F = 96500 C•mol-1 ； E° = -0.76 V for Zn2+/Zn and -1.18 V for Mn2+/Mn. Answer the following questions. (A) Indicate the anode, cathode, and direction of electron flow of the cell.    3% (B) Calculate the standard cell potential.    2% (C) The equilibrium constant of the cell reaction is K； log K = ?    2% (D) Find [Zn2+] after 10 min. of discharging.    3%

複選題23. One mole of an ideal gas (Cv = 2R), initially at X, undergoes three reversible steps of a cycle as shown below: Answer the following questions. (ln 3 = 1.1) (A) Find the temperature (T) at state Z.    2% (B) Find the work done (w) for step (3). 2% (C) Find the change in enthalpy (△H) for step (2).    3% (D) Find the heat (q) involved in a cycle.    3% 

複選題24. After people take the medicine X, it can be absorbed into the body through pathway A→B and enter the blood. Medicine in the blood can reduce its concentration through decomposition (B→C) or excretion (B→D), as shown in the figure below:  Assume that the process A→B is much faster than those of B→C and B→D. Therefore, each time a medicine with a dose of [X]o is taken, it can be regarded as immediately producing a concentration of [X]b (= 0.020 mM) of X in the blood. Assume that B→C and B→D are both first-order processes, and their rate constants are k1 (= 0.075 h-1 ) and k2 (= 0.025 h-1 ), respectively. If a person takes the same dose ([X]o) of the medicine every t hour, answer the following questions. (A) Just after taking the medicine for the nth time, its concentration in the blood is equal to [P]n. Express [P]n as a function of [X]b, k1, k2 and t.    3% (B) Continue to take the medicine every 6 hours for a long period of time (n→∞), calculate [P]∞ (in mM)?    3% (C) Find the half-life of the medicine in the blood.    2% (D) What proportion of the decrease in medicine concentration in the blood is caused by decomposition?    2%

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