Discussion on professional knowledge in 2012.

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8. Components A and B form an ideal gas-liquid equilibrium system. The mole fraction of A in the liquid phase is XA = 0.9, and its relative volatility is 3. Then the mole fraction of the component with the lower boiling point in the gas phase is: A. 0.95 B. 0.53 C. 0.45 D. 0.25 In my opinion, A is the component with the higher boiling point, while B is the one with the lower boiling point. (Yb/Xb)/Ya/Xa=3, Xa=0.9, Xb=0.1, Yb=0.25. 14. In terms of material balance, which of the following basic processes can chemical processes be considered as? A Mixing, heat transfer, mass transfer B Separation, chemical reaction, heat transfer C Chemical reaction, mixing, mass transfer D Mixing, chemical reaction, separation. I think the answer to this question is D. 17. In the production of ammonia from natural gas as a raw material, the substances are assumed to be ideal gases. The conversion reaction of methane vapor is: CH4(g) + H2O(g) → CO(g) + 3H2(g). If the amount of water vapor is increased, in what direction will the reaction proceed? A shifts in the direction of the reactants B has no effect C shifts in the direction of the products D cannot be determined. For this question, I think that increasing the water vapor content causes the reaction to shift in the direction of the products. C45. For a system with K components and no chemical reactions, the number of independent heat balance equations that cannot be determined is A K-1 B K C K+1 D 1. There is only 1 heat balance equation, so the answer is D