课程名称︰普通化学甲下 课程性质︰必修 课程教师︰林万寅 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰2012/4/18 考试时限（分钟）：110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.Pt(Z=78)froms a diamagnetic compound[Pt(en)2(CN)2]^2+[PtCl2(CN)2]^2-,where en =ethylenediamine (NH2CH2CH2NH2)and Cis the coordinating atom for the cyanato group(CN-).answer the following questions (A)give the oxidation states and the number of d electrons for Pt in both ions (B)name this coordination compound (C)give the d-electron configurations for the complex cation and anion (D)draw all possible structures for [Pt(en)(CN)2]^2+ (E)draw all possible structures for [PtCl2(CN)2]^2- 2.if each O2 molecule undergoes 4.40x10^9 collisions per second in a 30.0-L container at 300K and 1.00 atm,answer the following questions. (A)calculate the average speed of O2 molecule (B)find the mean free path of O2 molecule (C)estimate the molecular diameter(in nm) of O2 (D)estimate the van der Waal's constant b(in L.mol^-1)of O2,which is roughly four times it molar molecular volume (E)if the container is compressed to 1.00L and simultaneously cooled to 200K, the compressibility factor is found to be 0.940.Find the pressure of the gas. (F)estimate the van der Waal's constant a(in atm.L^2.mol.^-2)of O2 3.consider the ocean to be 0.500M NaCl solution. Answer the following questions assume complete dissociation of NaCl;density=1.00g/mL for all aqueous solutions; Na=23.0;Cl=35.5 (A)calculate the osmotic pressure of the ocean at 30.0'C (B)indicate the direction of water flow when seawater is separated from pure w aterby a semipermeable membrane. (C)estimate the minimum work required to transfer 5.00mol of water from seawater to pure water through a semipermeable membrane at 30.0'C? (D)if the vapor pressure of water at 20.0'C is 17.8 torr,what is the vapor pressure at 30'C?the molar enthalpy of vaporization for water is 40.0kJ.mol^-1 (E)find the vapor pressure of seawater at 30.0'C (F)if 6.00 g of a non-dissociating substance X dissolved in 94.0g of water is isotonic(i.e., same osmotic pressure) to the seawater,find the molar mass of X? 4.the thermodynamic properties for white tin and gray tin at 1 atm are given below: Sustance △Hf'(kJ.mol^-1) S'(J.K^-1.mol^-1) Density(g.cm^-3) White tin 0.00 51.5 7.31 gray tin -2.12 44.1 5.75 answer the following questions (Sn=118.7) (A)estimate the phase transition temperature(in 'C)for gray and white tin. (B)what is the stable form of tin at low temperatres? explain (C)what is the stable form of tin at high pressures? explain (D)calculate the work involved in the transition of 10.0 mol white tin to gray tin at the phase transition temperature and 1 atm (E)the slope of the phase transition curve is given by dP/dV=△S'/△V.estimate the phase transition temperature for white tin→gray tin at 100 atm.assume △S' and △V are independent of T and P. -- I am Captain America~~~~ --

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