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Given the thermochemical equations: $$\begin{array}{c}\mathrm{Br}_{2}(l)+\mathrm{F}_{2}(g) \longrightarrow 2 \mathrm{BrF}(g) \\\Delta H^{\circ}=-188 \mathrm{kJ} / \mathrm{mol} \\\mathrm{Br}_{2}(l)+3 \mathrm{F}_{2}(g) \longrightarrow 2 \mathrm{BrF}_{3}(g) \\\Delta H^{\circ}=-768 \mathrm{kJ} / \mathrm{mol}\end{array}$$calculate the $\Delta H_{\mathrm{rxn}}^{\circ}$ for the reaction $$\operatorname{BrF}(g)+\mathrm{F}_{2}(g) \longrightarrow \mathrm{BrF}_{3}(g)$$

Chemistry 101

Chapter 6

Thermochemistry

Rice University

Drexel University

University of Kentucky

Lectures

05:27

In chemistry, a chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Both reactants and products are involved in the chemical reactions.

06:42

In chemistry, energy is what is required to bring about a chemical reaction. The total energy of a system is the sum of the potential energy of its constituent particles and the kinetic energy of these particles. Chemical energy, also called bond energy, is the potential energy stored in the chemical bonds of a substance. Chemical energy is released when a bond is broken during chemical reactions.

02:09

Given that$$\begin…

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Given that$\mathrm{S}(…

01:58

Calculate $\Delta H^{\circ…

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Consider the reaction$…

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Given the following data:<…

so for this problem were given to thermal chemical equations and we want to find the delta H for a desired reaction. The desired reaction. Yes, the following. We want to find the dealt age for this. The two equations that were given were these ones and the 1st 1 You know that the dealt age this reaction is negative. 100 years. Pula jewels from all. In the second reaction, Delta H is negative. 768 kill jewels for more. No one skin When you're solving problems like these, right out all of the equations so you can cancel and identify which react, since eternity products etcetera very easily. So let's first look at this BRF that we have on the react inside right here. The only equation that contained any moles of BRF is very 1st 1 and you see that it's on the react inside, so we want to correct for two things. First is the idea that instead of two moles, you want to only go to one more, and we also want to flip it from being on the product side to direct inside. So to correct for both these things, we're going to multiply by a negative 1/2. And so the negative will flip the reaction, and the 1/2 will take recycled fish from 2 to 1. So that's off that the next thing that we want to do is we see that there is an F two have to Is any very good reacting to look at right now because both equations have f two. And so when you're stopping these kinds of problems instead, you want to look to whatever product or reacted only appears in one equation, and that will make it much easier So and said, We're gonna avoid F two for now and will verify that later. But we're gonna say Look to BRF three. And so once again, the only equation that has BRF threes the 2nd 1 while it's on the product side like we wanted to be. There's two moles, and we only want there to be one more so quick that we're gonna multiply this by 1/2 and you see that the F twos will cancel it properly. When you get the second equation, you will have 1.5 moles of F two, and here you will have negative. 1/2 mole of F two. We're essentially it'll be on the product side. But you see, when you add those to, you only get one will of F two, which is exactly what we want in the desired equation. So then, too finally, answer the question. We just need to multiply. Negative 1/2 negative. 188 men Add that to negative 716 times 1/2 not is he going to equally Delta H for the reaction? And then when you add all those together and your calculator, you will get the Delta H for the reaction is equal to negative. 290 chilled jewels crumble. That is the final answer.

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