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110年 - 110 國立臺北教育大學_碩士班招生考試_自然科學教育學系：化學#103775
> 申論題
5. Write molecular equations for the halogenation of ethane. (20%)
相關申論題
1. (a) A Carnot engine contains 0.250 mol of a monatomic ideal gas as its working fluid. Assume C, to be constant. If Th = 473 K, Tc= 373 K, V1 = 0.600 L, and if the compression ratio V3/V1 = 6.00, find the efficiency and calculate w, q, and entropy change for each of the steps in the cycle. (b) Calculate △U, △H and△S for the whole cycle. (20%)
#438900
2. Assume that the mole fraction of carbon dioxide in the earth' s atmosphere is 0.000306.(a) Estimate the mean free path between intermolecular collisions in the atmosphere at sea level if the temperature is 298 K.b) Estimate the number of collisions with other carbon dioxide molecules per second undergone by a carbon dioxide molecule under the conditions in (a). (20%)
#438901
3. A solution containing 4.48 ppm KMnO4 exhibits 85.9 %T in a 1.00-cm cell at 520 nm. Calculate the molar absorptivity of KMnO4 at this wavelength. (molar mass of KMnO4 = 158.03 g/mol) (20%)
#438902
4. (a) Derive an expression for the half-life of the reactant in a first-order process in terms of the rate constant k. (b) Find the natural lifetime for first-order reactions corresponding to half-life = 26.5 years. (20%)
#438903
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.
#550840
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.
#550839
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.
#550838
4.Consider the galvanic cell based on the following half-reactions, determine the overall cell reaction and calculate E°.
#550837
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
#550836
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.
#550835
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