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Problem 65

From the enthalpies of reaction $$\begin{aligned…

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Problem 64

From the enthalpies of reaction
$$\begin{aligned} 2 \mathrm{C}(s)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{CO}(g) & \Delta H=-221.0 \mathrm{kJ} \\ 2 \mathrm{C}(s)+\mathrm{O}_{2}(g)+4 \mathrm{H}_{2}(g) \longrightarrow 2 \mathrm{CH}_{3} \mathrm{OH}(g) & \Delta H=-402.4 \mathrm{kJ} \end{aligned}$$
calculate $\Delta H$ for the reaction $$\mathrm{CO}(g)+2 \mathrm{H}_{2}(g) \longrightarrow \mathrm{CH}_{3} \mathrm{OH}(g)$$

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Video Transcript

Okay, guys. So we're going to be doing Question sixty four in chapter five. I've from chemistry, the central science. We're going to be using these reactions in black to find and at what? The Delta Age for the reaction and blue is so we get. So when you add reactions together, whether you are also adding together, they rental piece. And if let's say you have a reaction we're who have of carbon on the left side and you added to reaction with the carbon on the right side, those carbons can't cancel out. You kind of think of this like an outward problem. So let's see what our product is. So we have carbon monoxide on the left, hygiene gas and left and methanol on the right. So in. So in this this equation, we have methanol on the right, right? And ha jin on left. So we're going to keep this reaction the way it is ever on this reaction we have of carbon dioxide on the right, as opposed to left. So we're gonna flip flip this equation around. So that's going to create to CEO yield to to to see, plus Oh, yes, yes, I think we felt the equation. We also have to flip. He dealt a value. You don't have negative two hundred forty one killing girls. We're gonna have a positive two hundred twenty one chili. Jules. Now we're going to put our other equation over here. It's on. Yes. And this is going to yield. Are methanol those? Okay, Now we're going to add these together either. So we have carbon to carbon on the last two cars on the right. Going cancel them out. Now we get to ox now began option and left after on the right. We cancel that out. So this creates a situation where we have to CEO plus four h too. Yields to methanol. So? So now we add, Aren't healthy agents here sixty twenty one plus negative for O two point four. Kill it, Jules. So the age for this reaction is going to be equal to negative one eighty one point for killing Jules. Now people can get confused here and think that's the answer. But they're wrong. That is not the answer. This question, because look and it's a reaction were producing two most mental and he refusing one mole of methanol So that means that the reef that the actual delta age we're going to be using is going to be one half of this. So we divide one negative one eighty one point for two over two, and that is going to be equal to negative ninety point seven. Kill it, Jules. And that is going to be the answer for the Delta H that we get from this reaction.

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