In this equation were asked to write some thermal chemical equations and play has this law for 234 tri metal plantain, which is, see what's wrong problem. See eight H 18. Also here C eight H 18. And our next page it'll be C eight H 18. So our thermo chemical equation. And actually I just noticed I'm just supposed to write a balanced chemical, not a thermal chemical equation for that one. So this is for combustion. So for combustion we have our fuel and all congestions have his reactant, oxygen. And for complete combustion our products are carbon dioxide and steve. Okay, now this has to be balanced. And when I look C eight H 18 up, I get my delta heat of formation is negative 5064.9 kg jewels. That's just a number. I looked up at the table. I have to keep my one right here. I don't like to put one's in equations, but in order to do that, that means that this is going to be 25/2 and I believe I got an eight and a nine. So there's my balanced chemical equation. This doesn't look very good. I'll make this look a little better. There we go then. Second, the formation of C eight age 18 from its products which are carbon or from its elements. Don't forget we have to include that. So there's a balanced chemical equation for part B. And for the last part were asked to use has this law to write a balance? And what are we doing here? Use has a sought to find delta H. Of the reaction, which of course is the summation of the products product delta H. Is minus the summation of the reactant delta H. S. So we can just look these up first, the products and I like to put in brackets first. So my products, my products are CO two politico to appear. And if we go back to our balanced chemical equation, I'm gonna go back here for a moment. We had for CO 28 nine and one for this. Remember that our delta H. Uh for this is zero because it's an element and in standard states. So there we have our heats of reaction and we are going to take eight times. I'm looking this value up on that appendix C. 3 93 0.5. Now all these are killer jewels but I'm going to leave it out for the sake of I'll just put it down here real little and we're going to add to that nine times for steam. It was negative to 41.8. Again, killer jewels. And from this we're going to subtract and remember their waters are oxygen is zero. So it's gonna be one. I'll put the one in there. A negative 506 49 Killer jewels plus zero. Okay, good enough. Do the math on here. And I got negative 2 59.3 killer jewels. Problem solved.