25.  The molar solubility of Pb(IO₃)₂ in a 0.10 M NaIOs solution is 2.4 × at 25°C.

(25A, 2%) Calculate the solubility product constant of Pb(IO₃)₂. 

(25B, ) Calculate the molar solubility of Pb(IO₃)₂ in pure water. 

(25C, ) Calculate the standard Gibbs free energy change (△G) for the dissolution of Pb(IO₃)₂ in H2O. 

(25D, ) Calculate when a chemical equilibrium is reached after mixing 20.0 mL of0.10 M NaIO₃ with 20.0 mL of 0.025 M Pb(NO₃)₂.

26.  Redox chemistry (26A, 5%) Balance the following redox reaction under acidic conditions and indicate the oxidizing agent and the reducing agent: (1) (26B, 2%) Write down the expression of the equilibrium constant K. for reaction (1) after balancing. (26C, 3%) The reaction (1) after balancing has a standard electromotive force (E0) of 0.56V. Calculate the value of the equilibrium constant K. at 25°C.  Planck constant h = 6.62608 x J s  Rydberg constant RH = 2.180 × J Avogadro constant Na = 6.02214 × Faraday constant F = 96485 C Ideal gas constant R = 0.08206 L atm = 62.36 L torr = 8.314 J  △G° = ΔΗ° - TASO △G° = -RTln K = -nFE° (cell)  Energy levels of hydrogenic atom: Boiling-point elevation: Freezing-point depression: First-order reaction: [A] = Second-order reaction: 1/[A] = 1/[A]0 + kt Arrhenius equation: k =

7.  Draw all the geometrical isomers of (en = ethylenediamine). Which of these isomers also has an optical isomer? Please draw clearly to receive full credit. Circle the one that has an optical isomer and draw the optical isomer also.

6.  For O2, , and , draw the molecular orbital (MO) diagram, fill in the electrons, and calculate the bond order for each. Which one has the strongest bond? Please draw clearly to receive full credit. For your convenience, you can draw only one MO diagram, but you must clearly indicate the electrons for each molecule and ions.

5.The heat combustion of acetylene, , at 25°C, is -1299 kJ/mol. At this temperature, the enthalpy of formation for and are -393 and -286 kJ/mol, respectively. Calculate for acetylene.

4.Consider the galvanic cell based on the following half-reactions, determine the overall cell reaction and calculate E°.

3. Draw the most stable Lewis structure (with the formal charge of each atoms minimized) for the following molecules or ions. Please also indicate the shape of the molecules or the ions. (A) O2 (B)  (C) SO3 (D) XeO3

2. Given the following equation: (A) What is the oxidizing agent? (B) What element is reduced? (C) Balance the reduction half reaction in acidic solution. (D) Balance the oxidation half reaction in acidic solution. (E) Balance the overall reaction in basic solution.

1. 25.0 kilograms of nitrogen gas and 5.00 kilograms of hydrogen gas are mixed and reacted to form ammonia. (A)  Write and balance the reaction. (B)  Which one is the limiting reagent? (C) How many grams of ammonia will form? (D)  How many grams of excess reagent remain?

(d)work in a cycle (in atm L).

(c) (in atm L), and

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