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### Ozone, $\mathrm{O}_{3}(g),$ is a form of elementa…

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Manhattan College

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Problem 40

The decomposition of $\mathrm{Ca}(\mathrm{OH})_{2}(s)$ into $\mathrm{CaO}(s)$ and $\mathrm{H}_{2} \mathrm{O}(g)$ at constant pressure requires the addition of 109 $\mathrm{kJ}$ of heat per mole of $\mathrm{Ca}(\mathrm{OH})_{2}$ . (a) Write a balanced thermochemical equation for the reaction. (b) Draw an enthalpy diagram for the reaction.

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## Video Transcript

Okay, guys, we're going to be doing question number forty in chapter five of chemistry to Central Science. We're going to be looking at the the decomposition of calcium hydroxide into calcium oxide and water water. So we're adding one hundred nine killer. Jules, a lot of heat to produce. If he comes this decomposition process first, we're going to balance our equation. So we have one counting on left side one count two on the right side. Now we have two hundred on the right and into hydrant on the left. And we have two options and left instructions on. Right. So this is perfectly balanced right now. This is the heat. Writing is wonder nine killer Jules, curb all of the full of our county. Um, hydroxide. Now, since you're adding heat into our system, that means with you move in and with an end of it within endo thermic reaction. Because we have to add, as we asked you adhi for system to make it work. We're not producing heat, So our delta eight under nine kill it, Jules. Now we're going to look at an entropy diagram, man. So we're gonna look a time, which is going to be over the course of the reaction, and then we're gonna have eight over here. So here we have. I'm just going to call this product. Just going to call. This is a and I'm gonna call decide. I'm going call this B, and I'm going to call this. See? So we're going to this air. It'LL be diagram. We're going is our activation energy hump. I'm going from a reactant store products. So we have a here, and we're going to be converting it to be and see. See, now you can know what the delta H is bi bi Just attracting the entry level here. Mind Sandra level he remember, Has his law dealt it? Still, the age for your reaction is equal to Delta is equal to That's your final in therapy minus your initial entropy. Hey. Okay, so it's going to be a hundred or not nine killer Jules, And that's how we solve this kind of problem. It's very easy. Once you will understand how has his low works and the relationship between heat between sheets and s an entropy this gets cue is going to equal your delta h