课程名称︰材料热力学 课程教师︰高振宏 开课学院：工学院 开课系所︰材料系 考试日期（年月日）︰97/4/3 考试时限（分钟）：120min 是否需发放奖励金：是 谢谢 （如未明确表示，则不予发放） 试题 : 1.(20%) One mole of solid A at 2500K is dissolved in a large amount of liquid. Raoultian solution of A and B, in which Xa=0.2 and, which is also at 2500K. Calculate the change in enthalpy and entropy caused by the addition. The normal melting temperature of A is 2538K, and it can be assumed that the ΔSm,a = ΔSm,b. The normal melting temperature of B is 2324K, and ΔHm,b= 107,500J/mol. 2.(20%) The system AB is a regular solution and can be described by the quesichemical model. The heat of vaporization composition of pure A is 95700 (J/mole)﹔that of pure B is 12700(J/mole). At a solution composition Xb=0.4 at 750K, the activity of component A is found to be 0.53. Calculate the bond energy of AB in this system.(Use FCC structure in calculation) 3.(20%) Prove that, in a binary solution if the Henry's law is obeyed for one component in some composition range, then the Roault's law is obeyed for the other component in the same composition range. 4.(10%) The moler excess Gibbs free energy of formation of solid solution in the system Au-Ni can be represented by G(XS)=XniXau(24140Xau+38280Xni-14230XauXni){1-(T/2660)} J Calculate the activities of Au and Ni in the alloy of Xau=0.5 at 1100K. 5.(10%) (a) Explain why μk　(dH'/dnk)s',p',nj = (dG'/nk)T,p,nj (偏微)(chemical potential) (10%) (b) So we can say that the chemical potential of component k, μk , equals to the partial molar enthalpy of component k. Is this correct? Explain your answer. (10%) (c) So we can say that the chemical potential of component k, μk, equals to the partial molar Gibbs free energy of component k. Is this correct? Explain your answer. --

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