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Consider this reaction: $$\begin{aligned} 2 \mathrm{CH}_{3} \mathrm{OH}(l)+3 \mathrm{O}_{2}(g) \longrightarrow & 4 \mathrm{H}_{2} \mathrm{O}(l)+2 \mathrm{CO}_{2}(g) \\& \Delta H=-1452.8 \mathrm{kJ} / \mathrm{mol} \end{aligned}$$What is the value of $\Delta H$ if (a) the equation is multiplied throughout by $2,$ (b) the direction of the reaction is reversed so that the products become the reactants and vice versa, (c) water vapor instead of liquid water is formed as the product?

a) $-2905.6 k J /$ molb) $1452.8 k J / \mathrm{mol}$c) $-1277.6 k J /$ mol

Chemistry 101

Chapter 6

Thermochemistry

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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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So this question gives us a chemical reaction as well as the the Delta h of that chemical reaction and give us a certain Siris of conditions to explain how the Delta H would change. So the Delta H of the initial equation is negative. 1452 0.8. Killer jewels promote It's a part, a part A says, that the equations multiply throughout by two, which means that there's double the amount of reactant and double the amount of products. In this case, whenever you multiply the equation a chemical equation by certain factor, the Delta H of that same equation is also multiplied by that same factor. So here, to Delta H I would just be twice of the initial equation, and that guilt is our answer of negative 2905 0.6 killed. Jules Promote the second part asks us to explain what would happen if the direction of the reaction is reversed so that the products become the reactant and vice versa. In this case, the Delta H would simply flip signs because now every single operation that you were doing when you're trying to find the heat information of the products and the heat information of the reactions is flipped. So in this case, Delta H would be a positive 1452.8. Killer jewels promote now parts. He explains. What would happen if water vapour instead of liquid water is formed as the product. So in this case, what we need to do is we need to subtract out the heat information of liquid water and instead at in the heat information of water vapor. So all you do is he would simply take the initial delta H, which is negative 1000 452.8 who take this initial value. And then you would have to subtract out the huge information of liquid water, which happens to be negative. 285.8 killer jewels promote. And then, on top of that, we would need to add in the heater information of liquid water vapor. So then we add formals times negative. 242 killed Jules Promote, which is the heat information of water vapor parole. When you take all of this together, we get the final answer. His negative. 1000 200 77 0.6. Kill it, Jules Permal. And so those are three final answers.

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