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At $25^{\circ} \mathrm{C},$ the standard enthalpy of formation of $\mathrm{HF}(a q)$ is given by $-320.1 \mathrm{kJ} / \mathrm{mol} ;$ of $\mathrm{OH}^{-}(a q),$ it is$-229.6 \mathrm{kJ} / \mathrm{mol} ;$ of $\mathrm{F}^{-}(a q),$ it is $-329.1 \mathrm{kJ} / \mathrm{mol} ;$ and of $\mathrm{H}_{2} \mathrm{O}(l),$ it is $-285.8 \mathrm{kJ} / \mathrm{mol}.$ (a) Calculate the standard enthalpy of neutralization of $\mathrm{HF}(a q):$ $$\mathrm{HF}(a q)+\mathrm{OH}^{-}(a q) \longrightarrow \mathrm{F}^{-}(a q)+\mathrm{H}_{2} \mathrm{O}(l)$$ (b) Using the value of $-56.2 \mathrm{kJ}$ as the standard enthalpy change for the reaction $$\mathrm{H}^{+}(a q)+\mathrm{OH}^{-}(a q) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)$$ calculate the standard enthalpy change for the reaction $$\mathrm{HF}(a q) \longrightarrow \mathrm{H}^{+}(a q)+\mathrm{F}^{-}(a q)$$

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$\Delta H=-65.2 \mathrm{KJ} / \mathrm{mol}$

Chemistry 101

Chapter 6

Thermochemistry

Carleton College

University of Maryland - University College

Brown University

University of Toronto

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.

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Be sure to answer all …

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The standard enthalpy chan…

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Use the given standard ent…

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The enthalpy change for th…

01:27

From given following equat…

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01:07

$\mathrm{H}_{2}(g)+\mathrm…

01:47

So this problem has two parts, and the first part We're supposed to find standard entropy of neutralization Hydrofluoric acid. So the chemical equation for that process is given to us. And if so, as always, we're trying to find the standard entropy of any chemical equation. Take the heats information with products. And then from there we subtract out that heats, informations or reactions, and all the heats informations are given to us. And the problem is, always need to dio is we need to put them together and multiply them by the moles. So we know that there's one mole of H 20 and that the heat affirmation for liquid water Negative. 285 0.8 killed Jules promote. Then we have Florida. I on. We have one mole of that in the heat of formation. For that is negative 329 0.1. And then we have to subtract out the heat information of Hydrofluoric acid. And we know that that given to us in the problem is going to be negative. 320 0.1, and then we subtract out once again the heat information of the hydroxide ion, which is negative 229 0.6. And all of these as shown here, the units of that our killer jewels from all. So when you calculate all of that, you get the Delta H for the entire reaction. I was just going to be negative. 65.2 to a jewels that answers part eight part B. We are given another equation, and we know that that that equation Delta H is no to 56.2. So this is the equation that we were given. And we're supposed to use the equation that we just solved. Do this, we know. But the state of entropy of that reaction in 1965.2 true jewels promote. So how do we combine these reactions together to get our desired reaction, which is just the dissolution of hydro for guys? Well, we first have to look to which equation has the hydra forecast, and the only one is the 2nd 1 and it's on the right side, and it has the right number of moles. So we know that we just keep this equation the same. You want to fight by one. The next thing that we have to look at is the H plus ions right here. The only equation that has that is a very 1st 1 While it is 1 to 1 more ratio like we want it to be, it's on the wrong side. It's supposed to be on the product side, Button said. In the first equation. It's on the reactive side. So we have to do if you have to multiply this by negative one. And so we add these together that will give us this equation, and we can do the exact same thing for the heats. So the first equation to take the negative so it would be positive 56.2, and then in the second equation, we leave it the same, and that's minus 65.2 cule jewels from all. And then when you subtract that, you will get that. The answer is nine point negative nine point killer jewels for more, and that is the final answer

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