EMA_4314_HW5_solutions

EMA_4314_HW5_solutions - EMA 4314 HW5 Solutions Discussion...

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EMA 4314 HW5 Solutions Discussion Questions 5.1 At equilibrium, the chemical potentials of any component in both the liquid and vapour phases must be equal. This is justified by the requirement that for systems at equilibrium under constant temperature and pressure conditions, with no additional work, Δ G = 0 (see eqn 3.36(b) and the answer to Discussion question 3.3). Here Δ G = μ i (v) - μ i (l), for all components, i , of the solution; hence their chemical potentials must be equal in the liquid and vapour phases. 5.4 A regular solution has an excess entropy of zero, but an excess enthalpy that is non-zero and dependent on composition, perhaps in the manner of eqn 5.28. We can think of a regular solution as one in which the different molecules of the solution are distributed randomly, as in an ideal solution, but have different energies of interaction with each other. 5.7 See Figure 5.1(a). Congruent melting is evident from the presence of liquid AB wherever liquids are present (along with whichever of A or B happens to be in excess).
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(b) See Figure 5.1(b). Incongruent melting is reflected in the absence of liquid AB
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EMA_4314_HW5_solutions - EMA 4314 HW5 Solutions Discussion...

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