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Consider the potential energy profiles for the following three reactions (from left to right). (1) Rank the rates (slowest to fastest) of the reactions. (2) Calculate $\Delta H$ for each reaction and determine which reaction(s) are exothermic and which reaction(s) are endothermic. Assume the reactions have roughly the same frequency factors.

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(a) reaction (b) $<$ reaction (c) $<$ reaction (a)(b) \begin{tabular}{ccc}\hline reaction & $\Delta H$ & description \\\hline (a) & $-40 \mathrm{kJ} / \mathrm{mol}$ & exothermic \\(b) & $20 \mathrm{kJ} / \mathrm{mol}$ & endothermic \\(c) & $-20 \mathrm{kJ} / \mathrm{mol}$ & exothermic \\\hline\end{tabular}

Chemistry 102

Chapter 6

Chemical Kinetics

Kinetics

Drexel University

University of Kentucky

Lectures

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Okay, So in this question, we see three potential energy diagrams for for reactions, and they want us to rank them from. So it's the fastest, uh, determine their delta H and then determine whether they're excellent. Chemical endo. Thermic right. So when we rank reactions based on how fast they are, we look at the activation energy. The reaction with the largest activation energy is the slowest. So we see that the activation energy right here is the activation energy. So where do we draw the Stargate? Activation Energy is a difference. And energy between the reacted and in peak. Right, That is the activation in it. And we see that it's 30 killed, Jules for a 54 B and 44 c. So first reaction is be because they have the largest activation energy. And then we have C, and then we have a which is the fastest. Now they want us to determine he doesn't age. So the Delta age is pretty much the difference and energy between the reacting and the products. Right. So we see that in a the difference between the reactive and the product and energy is negative. 40 killed, Jules, so for a Delta H. Is he going to negative 40 killed? Joe's promo for B. We see it definitely is 20 kill jobs for now. So for B, Delta H is equal to 20 killed. Jules promote The reason why is negative. Because if losing energy I'll be is positive because the product has more energy than the reactive now for see, we see that it's ah, negative. 20 killed Jules right here. So that's ages ago to negative. 20 killed Jules Paramo. And now they want us to determine whether there until Derek and excellent treatment, so excellent Emmick reactions are the ones that have a negative Delta h Right, So we see that a you see the A, x, o and C are negative, doesn't age. That means that so, Derek, that is a losing heat and we see that B is ended aldermanic because it's gaining heat

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