课程名称︰普通化学甲下 课程性质︰物理系大一必带 课程教师︰陆骏逸 开课学院：理学院 开课系所︰物理系 考试日期（年月日）︰2012/4/20 考试时限（分钟）：120 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.(20 pts)Given the following bond enthalpies data,estimate the ΔH°of the reaction. C3H8(g)+5O2(g)->3CO2(g)+4H2O(g) Table 12.5 Average Bond Enthalpies ￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣ Molar Enthalpy Bond Enthalpy (kJ mol^-1) of Atomization ______________________________________________________ (kJ mol^-1) H- C- C= C≡ N- N= N≡ O- O= ￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣ H 218.0 436 413 391 463 C 716.7 413 348 615 812 292 615 891 351 728 N 472.7 391 292 615 891 161 418 945 O 249.2 463 351 728 139 498 S 278.8 339 259 477 F 79.0 563 441 270 185 Cl 121.7 432 328 200 203 Br 111.9 366 276 I 106.8 299 240 ￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣ 2.(16 pts)One mole ideal gas expands from 24.4L(1atm) to 48.8L(0.5atm) at the constant temperature 300K. What is the work done on the gas? What is the heat absorbed by the gas? What is the entropy change of the gas? What is the entropy change for the enviroment? 3.(15 pts)Suppose Santa Claus gives you an engine,which absorbes heat 100J at 300K,50J at 250K,and releases 90J at 200K. Does this engine agree with the second law of thermodynamics? Explain your reasoning. 4.(10 pts)The vapor pressure of ammonia at -50℃ is 0.40atm;at 0℃,it is 4.2 atm. Calculate the molar enthalpy of vaporization of ammonia. 5.(20 pts)An electron is confined in a 1D box of 1nm width. Suppose that the electron can only occupy the first five energy levels. Draw the absorption spectrum(at the room temperature) of this system.(q=1.6*10^(-19)C, m=9.1*10^(-31)kg,h=6.6*10^(-34)Js) 6.(10 pts)Draw a plausible NMR spectrum of the molecule CH3CH2Cl. 7.(15 pts)In the pulse NMR experiment,what is the measured signal? How do you get the spectrum from the signal? --

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