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Determine the amount of heat (in kJ) given off when $1.26 \times 10^{4} \mathrm{g}$ of $\mathrm{NO}_{2}$ are produced according to the equation $$\begin{array}{r}2 \mathrm{NO}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{NO}_{2}(g) \\\Delta H=-114.6 \mathrm{kJ} / \mathrm{mol}\end{array}$$

$=1.57 \times 10^{4} k J$

Chemistry 101

Chapter 6

Thermochemistry

University of Central Florida

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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Determine the amount of he…

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From the enthalpies of rea…

So this question asked us to calculate the amount of heat given off when 1.26 times 10 before grams of any tour produced. Given that specific chemical equation in that chemical equation, we have dealt age. It's negative. 114.6 killer jewels Permal. And for that specific equation, two moles of Eno tour produce. So this is going to be the conversion factor that's going to be critical to the dimensional announces we're doing. The problem with his conversion is that it's in moles of attitude. We're not grams, which is our initial value. So weaken. Just divide by the molar mass of N 02 which happens the 46.1 grams. And since we have now converted to grams, you can multiply by the initial quantity. She's 1.26 times 10 to the four grams of attitude. When you multiply that equation through, you're going to get negative 1.57 times 10 to the negative. Four killed Jules. But the final answer is not negative. The reason why is because this negative sighing means that it's an exit thermic reaction. And that means that 1.57 times 74 killer jewels if you were released. But given that the question asked for the amount of heat given off and not simply for the Delta H, you can get rid of this negative sign into the final answer is simply a positive 1.57 times 10 to the four village ALS.

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