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How much heat is required to decompose $89.7 \mathrm{g}$ of $\mathrm{NH}_{4} \mathrm{Cl} ?$ (Hint: You may use the enthalpy of formation values at $25^{\circ} \mathrm{C}$ for the calculation.)

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$296.7 \frac{k J}{m o l}$

Chemistry 101

Chapter 6

Thermochemistry

Carleton 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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How much heat is required …

02:49

How much heat will be rele…

01:26

Given $\mathrm{N}_{2}(\mat…

01:24

The standard enthalpy of f…

01:17

03:52

Use standard enthalpies of…

The heat of formation of $…

03:10

02:16

Calculate the heat of reac…

So for this question, were supposed to find how much heat is required. Decomposed 89.7 grams of NH four seal. It's the first step in solving this problem is to actually write the decomposition reaction of any force Hell, and we know that NH four clt composes into ammonia. Well, it's hydrochloric acid, and that's already balanced for us. And next to find how much he is required, you could just find the Delta H or the standard dental P for this for this reaction. And that is just the heats informations of the products. You should subtract out the heats, informations of the reactions. And because everything here is just one more, it's a pretty straightforward calculation. So all you need to do is find it's information of products minus two reacted. So we know that the heat of formation of hydrochloric acid for every mole is negative, 92.3 collegial from all me. Then add the heat information for ammonia, which is negative 46.3. So, Jules, for more. And then finally we subtract out the heat information for ammonium chloride, which is negative. 315 0.39 killer jewels promote. And then when you add all of that together into your calculator, you'll get that the dealt age of this entire reaction. It's just 176 0.8. Kill Egil Cream bowl of reaction. However, this isn't the final answer, and we need to relate this to how much is decomposed for every gram of age four. Seal. So we know that 176.8 killed does is required for every mole of reaction. And in every bowl of reaction, there is one mole of a niche for seal. And now, to convert this into a proportion that involves grams, the only thing that we have to do is divide by the more mess. And we know that the more mass of NH four CEO is 53 0.4 nights, and then, lastly, the only thing that we need to do is then multiply by how much and each force decomposed, which at the very beginning of the problem, you were told it was 89.7 grams. So when you plug all of those numbers into a calculator, you'll get that the total heat that's required in the decomposition of that much. And each for Seo is 297. We're 296.7. Vigils promote. I just killed Jules. There's no ball, and that is the final answer.

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