Problem

The standard heat of formation of PI3(s) is -24.7…

03:58

Problem 131 Hard Difficulty

The standard heat of formation of CaBr2 is -675 kJ>mol. The first ionization energy of Ca is 590 kJ>mol, and its second ionization energy is 1145 kJ/mol. The heat of sublimation of Ca [Ca(s) Ca(g)] is 178 kJ>mol. The bond energy of Br2 is 193 kJ/mol, the heat of vaporization of Br2(l) is 31 kJ/mol, and the electron affinity of Br is -325 kJ>mol. Calculate the lattice energy of CaBr2.

Answer

$$
-2162 \mathrm{kJ} / \mathrm{mol}
$$

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03:44

Aadit S.

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Video Transcript

So in this video we are looking at how to calculate for the largest energy of uh and any compound. And the company we are talking about is cash in bromine in this particular question. So what is largest energy it is the energy released Right. When an ionic solid falls from is the IRS. So if it's released it should be exempt thermic negative. And in this question we will use uh the born haber cycle. Yeah. Yeah. The bonds hebrew cycles. All right. So how is this compound? Kachin bromide phone from his uh ions. So the elements cassie um salad and remain liquid. We need to have the gaseous ions of those elements. So first of all cars um solid must be chain into. It must be changed into gas to form because Yes. All right. And the and to pee The energy for this one is start interview of sublimation because it changed from solid to gas. Then uh Qassem The charge of customers to plus it means it loses two electrons. All right. So we need to remove two electrons. So the first electron will be removed. Which is the first ionization energy. So first an ionization energy to form costume plus then the second electron is removed. And the energy second Yeah. Yeah, perform because um two plus. Yes. Yeah. Then they remain liquid must be rep arised. Right? The premium liquid must be surprised to form romain. Yes. And the energy for that one is senator entered pure vaporization. Okay. Then we need to break the atoms of remain to the the free geishas atoms and we need to break down to form brominated to. All right. And the energies bondage association energy, they bring their ponds. It formed that then we need to add electrons. Now we have to bremen atoms in the compound. So it means that we're adding to determine We're adding two electrons to the prom in atoms to form Yeah, the Okay, Form two of this. All right. So when we add this, I am yeah to this I am. We'll form right that compound. And the energy giving out. It's up what we call the largest energy. All right. Now the formation the combination of Qasem solid to broom in liquid. The energy change for that's one It's end up your formation. All right. Now in this question the enter of your formation is minus 675. Kill a juice and more. Alright. The end up your seldom nation. This one is 1 78 killer. Just pay more. And the first ionization energies five 90 killer just pay more. And the second organization and I just 1145 killer juice. Permal. All right. And the entropy of representation. Okay. Is 31 killer judges. Uh huh. Been more. What of your dissociation? This one is 193. Can I just pay more then? Uh The addition of the electrons electron affinity by adding two electrons. So it's too times the electron affinity. Okay. And that would be two times uh -3: five. Okay. So the combination of all these energies, The sublimation first, ionization. Second analyzing energy. The vaporization association electron affinity and a lattice energy should be called to end up your formation. All right. So, the end up your formation. Mhm. Because the submission. Mhm. Okay. Last first. Yeah. An Ionization Energy Plus 2nd. You're not organization energy plus an therapy of Yeah, the authorization plus. Mhm. And therapy of dissociation. Thank you. Plus the electron affinity. Two times the electron affinity. Last lattice energy. All right. So, it means that mine is -675. Yeah. Because the addition of all those energies. All right. And when you add all those energies, you have 14. Yeah. 8 7. Last largest energy. Okay. So the largest energy. Yeah. Because -675 -14. It's um Which is equal to -2162. See the jews but more. Uh huh. Yeah. All right. Yeah. So, we use the born haber cycle. Right? And break all the items into the free gaseous ions. And when we are the energies should be equal to the entropy information. So from there we can find the largest energy. Thank you. Mhm.

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