【Test Your Knowledge】Basic Chemical Engineering Knowledge (306) – Please hide your replies
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In accordance with the forum’s uniform requirements, the maximum score for this event is 15 Wealth points, and rating charm is prohibited. At the same time, friend requests and repeated ratings are declined. Note: 3 points are awarded for each correct answer; a score will only be given if at least 3 questions are answered correctly. Do not answer questions repeatedly. A certain amount of extra points will be given for a detailed explanation. The answer format for true/false questions is: true, false, true, true, false. 1. At a certain temperature T (but T
Correct answer: 1. Wrong, because the saturated vapor pressure of a pure substance represents the pressure at equilibrium between the vapor and liquid phases. According to the phase rule, a pure substance has 1 degree of freedom at its vapor-liquid equilibrium state; if T is known, its vapor pressure is determined. In a state equation with known constants, although there are three variables—P, V, and T—there are two equations: the state equation and the vapor-liquid equilibrium rule; thus, the vapor pressure at a certain temperature can be calculated. 2. The mistake is exactly the opposite. 3. Wrong, they are the same at the boiling point. 4. Right. 5. Yes, because x1=y1=1.
1-Yes； 2- Wrong, because the bubble point curve represents the saturated liquid phase, while the dew point curve represents the saturated vapor phase ； 3- Wrong, it should be the same ； 4-Yes ； 5-Pair
Question 4 is also wrong, right? It should be standard pressure.
1. Wrong, because the saturated vapor pressure of a pure substance represents the pressure at equilibrium between the vapor and liquid phases. According to the phase rule, a pure substance has 1 degree of freedom at its vapor-liquid equilibrium state; if T is known, its vapor pressure is determined. In a state equation with known constants, although there are three variables—P, V, and T—there are two equations: the state equation and the vapor-liquid equilibrium rule; thus, the vapor pressure at a certain temperature can be calculated. 2. The mistake is exactly the opposite. 3. Wrong, they are the same at the boiling point. 4. Right. 5. Yes, because x1=y1=1. 1# qazxsw119