114年 - 114 臺灣綜合大學系統_學士班轉學生考試試題:普通化學A#138275

(1)(4 points) Write and balance the reaction.

(2)(2 points) Which one is the limiting reagent?

(3)(5 points) How many grams of ammonia will form?

(4)(5 points) How many grams of excess reagent remain?

(1)(1 point) What is the oxidizing agent?

(2)(1 point) What element is reduced?

(3)(5 points) Balance the reduction half reaction in acidic solution.

(4)(5 points) Balance the oxidation half reaction in acidic solution.

(5)(5 points) Balance the overall reaction in basic solution.

(1) O₂

(2) NO₃⁻

(3) SO₃

(4) XeO₃

4.(10 points) Consider the galvanic cell based on the following half-reactions, determine the overall cell reaction and calculate E°.
Fe²⁺(aq) + 2 e⁻ → Fe(s) E° = -0.44 V
Zn²⁺(aq) + 2 e⁻ → Zn(s) E° = -0.76 V

5.(10 points) The heat combustion of acetylene, C₂H₂_(g), at 25°C, is -1299 kJ/mol. At this temperature, the enthalpy of formation (ΔH°_f) for CO₂_(g) and H₂O_(l) are -393 and -286 kJ/mol, respectively. Calculate ΔH°_f for acetylene.

6.(15 points) For O₂, O₂⁺, and O₂⁻, 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.

7.(12 points) Draw all the geometrical isomers of [Cr(en)(NH₃)₂BrCl]⁺ (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.