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

科目：研究所、轉學考(插大)◆普通化學 | 年份：110年 | 選擇題數：0 | 申論題數：5

試卷資訊

所屬科目：研究所、轉學考(插大)◆普通化學

選擇題 (0)

申論題 (5)

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%)
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%)
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%)
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%)
5. Write molecular equations for the halogenation of ethane. (20%)