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Comnbustion of propane thermnodynatnic values provided at the end of the ezatn) proceeds &s:CyIs(g) + 5O2(g) v 3CO2(g) + 4H,O() What are the changes in the stan...

Question

Comnbustion of propane thermnodynatnic values provided at the end of the ezatn) proceeds &s:CyIs(g) + 5O2(g) v 3CO2(g) + 4H,O() What are the changes in the standard reaction enthalpy; entropy and Gibbs free energy at 298 K? b) Is this process spOntaneous Or nOIl-spontaneous under standard condi- tions? (justify yOur answer) Is this reaction exothermic Or endothermnic at cOnstant pressure? What is the value of heat 9, produced absorbed if one Inole of propane reacts with excess amount of 0z

Comnbustion of propane thermnodynatnic values provided at the end of the ezatn) proceeds &s: CyIs(g) + 5O2(g) v 3CO2(g) + 4H,O() What are the changes in the standard reaction enthalpy; entropy and Gibbs free energy at 298 K? b) Is this process spOntaneous Or nOIl-spontaneous under standard condi- tions? (justify yOur answer) Is this reaction exothermic Or endothermnic at cOnstant pressure? What is the value of heat 9, produced absorbed if one Inole of propane reacts with excess amount of 0z? Based on the values obtained in parl a) , what would yOu say about the magnitude of the equilibrium constant for this reaction?



Answers

A $1.000 \mathrm{~mol}$ sample of propane, a gas used for cooking in many rural areas, was placed in a bomb calorimeter with excess oxygen and ignited. The initial temperature of the calorimeter was $25.000^{\circ} \mathrm{C}$ and its total heat capacity was $97.13 \mathrm{~kJ}^{\circ} \mathrm{C}^{-1}$. The reaction raised the temperature of the calorimeter to $27.282^{\circ} \mathrm{C}$. (a) Write the balanced chemical equation for the reaction in the calorimeter. (b) How many joules were liberated in this reaction? (c) What is the heat of reaction of propane with oxygen expressed in kilojoules per mole of $\mathrm{C}_{3} \mathrm{H}_{8}$ burned?

Starting with pot, eh? First, we need to calculate the molar mass off propane, so it's C three h eight three molecules off carbon multiplied with its smaller months plus eight atoms for hydrogen multiplied with them. Will Amar's give small amasses 44 grounds for more? No, we need to calculate the number off pulls off pain. So n more physical weight divided by Captain Capital. And that is molecular mass. So we have this 15.5 and more little amasses 44 which gives us 0.352 molds off propane for heat absorbed. We already know the heat absorbed our moon so he'd absorbed that considered it as Etch will be equal to 0.352 multiplied with 2 to 0 Hello Jones divided by one more, which gives 782 kilo. Jules for option. Being again, we need to calculate the morning mass, which will be 1 37.33 plus 10 multiplied with 16 plus 12 multiplied with one which gives 309.3 three grams one more again calculating the number off moles. Thatis n equals they divided by molecular mass which is 4.88 crumbs divided by 309 point 33 more Nicodemus, get zero point Tzeitel, one for you. Meet moles. No, he'd absorbed by the specific mole off compound will be equal to just using unitary method actually will be the heat a blob 0.0 one Fight eat multiplied with you D 0.3 Killer do it gives 1.27 Can you, Jules?

We have to accomplish from reaction force upon the like the com bust run for this seat. Lee H. Eight on Be Balanced the Equation, Which means that's the same. Three. Push eight me change to throw two plus s tour on the the Balance the carbon and hydrogen in both side. Then be calculate the molar mass off this century. Hush 81 more question particles points little. Eight. Get on. We want to see that if we have this little point, it's 584 grand. How much morality is way? Have one more on the weight of one more on be calculated. The world in this camp way had the interview off these reaction, and we divided it by mourner on. We can calculate the conditional Pamela by the late because it is indeterminate. Can it's released the heat we need to go through minus because it's released. Course the trend. Ah, six thing. It is this thing. It's generates Soto on hostile. We calculate that how much the molar mass of thesis on the Moller one mole off. This is 136.23 but we have 0.136 gram off it. We want to know that how much the moral of the this direction We have been weight off one's mold on the calculated. How much the mole off this ration is. After that, we divided. Then Children showed by more on the rich to the collusion Permal off stand fraction for, say, hush tree two times. So, too, it is the same knee road than the reactions it gives us Soto and hostile. And then we buzzers the Carbone and hydrogen invoice both side. We have to carbon in one side. We goto Carbone beside the soldier who they have a trained and they have six hydrogen people. Three here. And after that, you can play the molar mass off thes the molar mass off the component is gonna fight 58 points. There are 806 Then we calculate that ho mushroom will be have in the amount that was given. This is the moon that is calculated. Then be divided. The collusion by moon on it becomes minus 1.8, um, off 10 times or their condition permanent. And they should consider that because it is combustion, it released energy. So all of the Central Asia and the interface should be minus

We have three in reactions. Milton is C three inch eight on the right. The combustion lost auto. It gives still to Gus. Ich tour edge to Oh, the ball in seat by Charbonneau and hydrogen. Fine. Three four The molar mass off the certainly hush. Uh huh. Eighties 44 0.8 Skim. Okay, we want to know that. How much more ladies it is for one more. We have zero point fork Londres 84 grand and we want to identify that. How much more meetings? The answer is was zero point zero. No, we want to. Carefully the Delta outage. I wish it wants to. Minus 29. Poor Ah point for divided by the mole. That be calculated? Little point Zittel 13. And it because too minus 2200 61 chin. You sure? Permal Okay. This for the first reaction. For the second reaction we have See Clan Edge 16 the last photo because it is a combustion. We have the same components. Feel too. Last fish tour is too. Oh, we pulls the carbon and hydrogen here. 800 hide Russia 10 Terrible. And here 14 or two. This scene one more off the SE see 10 h 16. It calls to 160 136 point 23 gram. We don't know how much more he tees in the zero point 100 terraces. Six? Yeah, From here we can calculate X calls toe extra close tools. Little point line tonight looking. After that, we avoided the Moeller and then Peter Shoulder five point 20. So there, by the mold, that's we calculated. Zero point 99. And because toe buying this, why point nine polls? The same unusual paramount under less reaction use. See, it's three true climbs people just all true equals two See? Oh, true plus age. True. Oh, okay. Meeting balance here. Two years on. Three here highlights Russian and I'm terrible on here. Should be three. We have the merely leads to a point. Tears for you Minutes wants to apply the density. I didn't buy density Little point 790 long. It calls school one point 86 grand. How much this graham it calls to mall. We don't know. We should calculate it, but for one more we know the weight for bomb bullets. He's 58 see. Get up. I'm from here. We can calculate the east on Mullah. He's homes. There's little point was little. 32 more. You'd be divided. The killing shoulder, which is more minus 58 point three by his little point a little. Here's to it's because, too minus 1.8 order off 1000. You sure you do? Sure caramels.

All right, guys, we're going to be doing problem forty four. In fact, they're five in chemistry, the central science. So we're gonna look at the following equation. We have it right here where methanol is being converted into methane and oxygen. Now, part a were asking if this reaction is except America ended. Since we have dealt ages, great zero if by definition and other, if there's a lesson here than accept. So we're going to calculate the amount of heat transferred when twenty four grams of methanol is composed by this reaction action. So we have to change this equation. We have tio act like we're using one one gram. Sorry. One mole of methanol produces one mole of methane Jane and half a mole of oxygen. Question This is going to be so that's going to change this, for it is from one point six point four killer jewels that one point six point four killed. Jules, her mole. So permal of methane we used This is how much energy we're producing. So if we do this, we have to convert this into malls twenty four or grams over us thirty two grams per mall. Oh, so that's going to give us your point seven five malls calls. Now we're going to multiply zero point seven five one twenty six point four Earth. And that's going to give though the most can flat, and that's going to give us ninety four point eight eight. Kill it, Jules. And in this case, hey, C'Mon aki transferred is equal to the to the the entropy cues. Q is equal to Delta h h. So that means that this is the value of our cue, our humanity that transferred now for section C, we're going to as they're looking, seeing the age for this transition. Forgive example of methanol is eighty two point one killer Jules. So how many grams of methane gas are produced? So first? So the way we figure this out is we know how many killers use aircrews for mole. So by using this, we can find out many balls we have so do eighty two point one one killer Jules over one twenty six point four villages for more. Well, so a key point. One divide by one twenty six point four. There's going to be zero point six five moles right now. We're going to convert that zero point six five moles in two grams. So we're going to multiply this by the molecular weight. Eight of our methanol. Sorry, our methane. So thirty, so sixteen grams per mall and that's going to give us ten points. Ten point four grams Ems of methane are produced. Give it They've given a sample that produces this much energy. Now for a party. The harmony killed jewels of heat are released when thirty point five grams of methane react simply with oh, two different form form seat form C, C for methanol. So we're actually going tohave to flip this with this equation because we're not using methanol to produce. There, you see age we're not using methadone procedure for and oxygen were used reacting methane oxygen to produce. You see, it's three now. Now to start off, we're going to have to flip that. So we have have negative one hundred twenty six point four killer just formal. So we're going to convert. No, now we're going to convert Earth our mass into moles confirmed. I think so. That's going to produce two point four for most. So then we're going to multiply and negative one twenty six explained four two point four. And we get atnegative. That's it. Negative. Three. This negative three hundred, you point four Killer. Jules LS. And since the remember Delta H sequel to Q. Yes, thank you. So we're going to. So we're releasing a magnet as so when we're talking about the key thing about amount of heat released. So we're dealing with it in terms of magnitude. So in this case that the age is going to be equal to negative. Q. The negative delta is going to be equal to Q. Because if if negative amount of heat is released, then that means that you're absorbing heat. So the magnitude of Q is going to be a three hundred and three point four our killer Jules. So you should think about the wording off the question when you're answering it, because that can affect the sign of a sign of your answer.


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