课程名称︰普通化学丙 课程性质︰系定必修 课程教师︰张大钊 开课学院：生农学院 开课系所︰兽医+植微 考试日期（年月日）︰2010／12／29 考试时限（分钟）：10:20~11:20(60min) 是否需发放奖励金：是 （如未明确表示，则不予发放）课程名称︰ 试题 : 1.How much heat(kJ)is required to raise the temperature of 1000 g of water from 25 。C to 100 。C? (specific heat of water is 4.18Jg^-1 。C^-1) (8prs) 2.Calculate the boiling point of liquid Br2, where △H。=31.0kJ/mol and S。=93.0JK^-1mol^-1. (8pts) 3.Calculate the value of Keq (equilibrium constant)at 25。C for a reaction: 2 NO2(g)<->N2O4(g), where △G。f(。右上缩小；f右下缩小) is 51.3 kJ for NO2 and 97.8 kJ for N2O4.(8pts) 4.Calculate the final temperature and the work done when Ar is used in an irreversible adiabatic expansion from 0.5 to 1.0 L at initial of 25。C. (8pts) 5.Assuming that the ammonia synthesis reaction reaches equilibrium at pressure of N2=1.47 atm, H2=0.01 atm, and NH3=1.0 atm at 25。C for the following reaction N2+3 H2(g)→2 NH3(g) △H=-92kJ/mol (a)Calculate the △G。of this reaction at 25。C, (b)Under what temperature condition, the reaction favors the product. (c)Calculate the △G if double the pressure of NH3, (d)Calculate the value of K at 600。C. (16pts) 6.We used Differential Scanning Calorimetry (DSC) to measure the heat released from folded to unfolded states of DNA, F→U. A similar DSC melting curve is given as:(给一个X轴为T,。C Y轴为 ?Cp(Kcal/mol/。c)的图形) Calculate △H。, △S。 and △G at 25。C of this reaction. (16pts) 7.If Pex is held constant at 1 atm, cal q, w, and △E on a system of 5 mole of gas as it (a)irreversibly and (b)reversibly isothermally expand at 25。C from 10 atm to 1 atm, and determine △S_total=△S_sys+△S_surr for both (a) and (b) expansions. (16pts) 8.Consider the reaction: CO(g)+H2O(g)<->CO2(g)+H2(g), (a)calculate △H。 and △S。if the value of Keq are 210 at 478K, 73 at 533 K (b)determine Keq for the reaction at 298K. (16pts) 9.A Carnot cycle uses 1.0 mole of an ideal gas from an initial state of 10.0 atm and 500K to a pressure of 1.0 atm via isothermal expansion (step1), and then to a temperature of 300K via adiabatic expansion (step2), This expansion is followed by an isothermal compression (step3) and then an adiabatic compression (step4) back to the initial state. (a)Determine q and w for each step of the cycle. (b)Calculate the efficiency (total work/heat absorb) in Carnot cycle. (c)Calculate the amount of heat absorbed by the engine and heat discharged at 300K. (24pts) --

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