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0 / 4 ptsQuestion 3Which PEC diagram best represents the phase behavior of Cryogen A and Cryogen B? liquid, g gas)AU) BIU]AIB (g)AB (g)NB (g)AJB (g)#of Configuratio...

Question

0 / 4 ptsQuestion 3Which PEC diagram best represents the phase behavior of Cryogen A and Cryogen B? liquid, g gas)AU) BIU]AIB (g)AB (g)NB (g)AJB (g)#of Configurations#of Configurations#of Conliguralions#of Configuratlons

0 / 4 pts Question 3 Which PEC diagram best represents the phase behavior of Cryogen A and Cryogen B? liquid, g gas) AU) BIU] AIB (g) AB (g) NB (g) AJB (g) #of Configurations #of Configurations #of Conliguralions #of Configuratlons



Answers

The phase diagram for $\mathrm{SO}_{2}$ is shown here. (a) What does this diagram tell you about the enthalpy change in the reaction $\mathrm{SO}_{2}(l) \longrightarrow \mathrm{SO}_{2}(g) ?(\mathbf{b})$ Calculate the equilibrium constant for this reaction at $100^{\circ} \mathrm{C}$ and at $0^{\circ} \mathrm{C}$. (c) Why is it not possible to calculate an equilibrium constant between the gas and liquid phases in the supercritical region? (d) At which of the three points marked in red does $\mathrm{SO}_{2}(g)$ most closely approach ideal-gas behavior? (e) At which of the three red points does $\mathrm{SO}_{2}(g)$ behave least ideally?

Okay, so we're going to use this phase diagram to answer some questions. So we want to figure out where there's an equilibrium between the solid and vapor phase. Okay, so that's going to be on the line that is kind of curved going up to the triple point. So you can see that's going to be point A. And then that point G. The one that's way up top, that's where you have a supercritical liquid. Mm. And then we want to know if the boiling point increases as the pressure decreases. Well, I think the vapor pressure always increases as the pressure as the temperature increases. So this is a no. And then where can we find it? Only in the gas phase? Okay, so if we add to this picture, we want it to be somewhere over in here and we can see that that's going to be point after. And as a melting point increase as we increase the pressure. Well, that is true. If we if the line slants to the right and this line actually does slant to the right. So this is a yes. Mhm. Can we sublime at any pressure where we can sublime? We can go from a solid from a vapor at any pressure below the triple point. So that's going to be a no, you have to be below the triple point pressure to do that. Okay, and then since our line is slanting forward, that solid line there, that tells us that the density of the solid is larger than the density of the liquid. So the answer to this question is no

Okay. So we've sketched um a phase diagram for carbon dioxide. It's not to scale, but we've sketched in a triple point, right, and it's critical temperature and we know that at about one atmosphere it's going to sublime. So there's another temperature here, Which is about -785. Yeah, so those are degrees Celsius, This is one atmosphere. So the first thing we're asked is to estimate at about zero mm what what would the pressure be? You know, we didn't draw this to scale. So it's it's a pure estimate, but I'd say it's somewhere between 30 and 40 atmospheres, that's zero degrees. Okay. And then we need to find a spot where we're at about negative 50 and 10. And I'd say it's I'd say negative 50 here and 10 needs to be about here. So I'd say we're up here right in the liquid state. So, so yes, I'd say that is definitely a liquid. I also should have labeled this axis. Those are our pressures and atmospheres

Right for this first question I've extracted on the face. Day groom. Okay, so, um, going tears these this particular face their crime. Okay, um, this diagram him. All right, So, um, uh, question a phone for question, A okay for no question a ah face. You know, the face on the substance face of a substance that that that, you know, found that is founded. Room temperature and pressure out of TP. Okay, room temperature and pressure. It's a 20 atmosphere. Okay, um is going to be Gus. Okay? Because if you look at what where one atmosphere is Ah, the glamour that was fear. Pressure is precious. Michigan atmospheres and its states. Um, the way access. Okay. And it's right here. One is right here. Okay, so when you go course, when you got close going to get the time rooter pretend pressure is supposed to be around 25 degrees Celsius, right? That means for the rest of this going, the right side is good to be to be gas. So that means our substance going to exist in Gas state or it then for part B. Okay, I still in the diagram. If the pressure exerted the sample is, you know, 0.7 a selling five atmospheres. Okay, if the pressure exerted 0.5 atmospheres in the temperature is, um, negative. 114. All right degrees. So she is what? Face the substance exit. So that means Wouldn't look at the graph. Right. So we got to locate 0.75 Most Rickles roughly estimate that. Okay. And then went to look at where? That the sex There. One negative. 114. Ah, on the X axis. Okay, so, um, when you look closely when you look closely Oh, are open self help somewhere is somewhere, you know? They're okay. There, there, then, um, the 31 14. Suppose to be afternoon. That too. 1 15 You know, because the was decided so somewhere, somewhere there. So where this talking to the sex? It needed to be somewhere in the liquid face. Right. So this face is going to be We could Okay. Ah, for part C for part C. Still on days still in the dead ground. Right? If you know, we've given a river pressure off 380. Okay. 380 millimeter. Mercuri and then we need to find the temperature off these substance, you know, temperature at these pressure. But we quite well know that one millimeter mercury, Okay, is has equivalent off. Um, 0.0 Ah, 13 16 atmospheres. Okay, so go to need to find how many atmospheres does 380 Believe me to McCoury makeup. Okay, so this request might play going to get, um, around zero point of fire atmospheres. Okay, So if no way, if if you have this terrible favor atmospheres, we're going toe today to our taxes. Okay, we locates. Retreat. Locate these Open frame. Then we see the corresponding temperature on the on the on the X axis. Okay, so 0.5 is there Okay now. So when glucose glucose, whether the intercept Mrs somewhere there, toe close to 1 20 So correspondent approaches close to I want to enter the great social. Is there? Okay, so there's a temperature for this vapor pressure. So in and get you 1 20 because searches, but full but part D. OK, but the there the pressure will go to were asked to tradition in the overpressure. That's negative. 1 22 degrees. So she's okay. 100 research is Ah, you know, comes before negative 1 20 Okay. Is somewhere there somewhere? Um, somewhere. You know, they're okay. This is This should be less than 0.37 most years. Right? So, um, if if this is 1 21 because negative want to introduce Bristle. She is there, and we have a correspondent of Atmosphere is off 0.37 So our world is going to be slightly less than 0.37 atmospheres. Okay. Yes. So, uh, roughly something to do with frequent, um, to aids, you know, frequent tweet. There. Okay. Must begins. Uh, there's no points. You cross my playing, you know, equating number 22 23 27 water boats wanting to. All right. Ah, for part e. Okay. Uh um, why solids are ah, denser, right solids. Look, a structure of solids. If this structure off its arguments, will it? Okay, for instance, victory illustrate how particles behave or how particles are between solids and liquids. Okay, so if he's, uh, these are particular solid in this dinner is elected. So there's a solids. These are liquids. Are you get that? Particles in solids are densely packed, you know, a densely packed and then there pucks E in a close, you know, they're closely packed and then that they're in ordered fashion. Okay, The ordered fashion. And then that densely packed tensely, Very much densely packed. Okay, densely. And then in ordered fashion, right. All through these a this particular a space, but for liquids met its very sparsely practical widely. And then Hitler your profession. So between this, too, will get that socialism more dense. Okay, so let's a more dance, huh? With the look, it's because off the particles are closely parked, and then they have, um um uh, you know, on order, you know. Oh, ordered particles are a parking ordered if I Sure. Okay. All right.

So this question wants us to use the given phase diagram to answer a couple of questions. First, the question is asking What phases Substance at room temperature, which is 25 degrees Celsius and at one atmosphere. So as the batteries for the solid and liquid phases intersect at one atmosphere at negative 112 Celsius and negative 108 Celsius respectively. We can extrapolate that at 25 degrees Celsius at what, at one atmosphere, substance will be a gas. Um natural questions asking what phases a substance at 0.75 atmospheres and at negative 114 degrees Celsius and going across the phase diagram to 104 negative 114 degrees Celsius at um, 0.75 atmospheres. We'll find the substance should be a liquid at thes conditions. Um, next question is asking what is the temperature of the liquid phase at 380 millimeters of mercury? So first we need to convert the pressure from millimeters of Mercury two atmospheres and we should find that 380 millimeters of mercury is equivalent thio 3800.5 atmospheres and at 0.5 atmospheres. If the substance is at a liquid phase, then its temperature must be between, um, negative 117 Celsius and negative 119 Celsius. Um next, the question is asking, What is the vapor pressure of the solid phase? Um, at negative, 122 degrees Celsius. And if the substance is a solid at negative 102 degrees Celsius, the vapor pressure must be greater than 0.36 atmospheres on Beacon. Do that just by reading up the boundary line. Um, given the temperature and the phase, Um, the question says it is, um, Finally, the question is asking which phase is more dense, the solid or liquid phase. And given that the slope of the melting point, um, is positive, we conceive e that on increase in pressure, which, if the equilibrium towards solid, whereas a decrease in pressure, which, if the equilibrium towards liquid. Given this relationship with pressure, we can confirm that liquid must be less dense than the solid in the solid state is the more is theme or dense one


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