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AP Chemistry
6.6 Introduction to Enthalpy of Reaction
6.2 Energy Diagrams
6.1 Endothermic and Exothermic Processes
IntermediateMCQConceptual21.2k
A grayscale reaction energy profile with bare axes and no gridlines. The vertical axis is labeled 'Potential Energy' and the horizontal axis is labeled 'Reaction Coordinate'. A single solid black curve begins on the left at a flat plateau representing reactants labeled '2 SO2(g) + O2(g)'. The curve rises to a single smooth peak representing the transition state, and then falls to a lower horizontal plateau on the right representing products labeled '2 SO3(g)'. A vertical double-headed arrow between the reactant plateau and the peak is labeled 'Ea'. A vertical double-headed arrow between the reactant plateau and the product plateau is labeled 'Delta H rxn'. No other curves, gridlines, colors, or decorative annotations appear.
Reaction energy profile for \(2\,\text{SO}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\,\text{SO}_3\text{(g)}\).
The reaction energy profile for the uncatalyzed oxidation of sulfur dioxide is shown in the diagram.

\[ 2\,\text{SO}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\,\text{SO}_3\text{(g)} \quad \Delta H^\circ_{\text{rxn}} = -198\text{ kJ/mol}_{\text{rxn}} \]

A suitable solid catalyst is added to the system, providing an alternate mechanism with a lower activation energy. Which of the following best predicts the changes to the activation energy, \(E_a\), and the standard enthalpy of reaction, \(\Delta H^\circ_{\text{rxn}}\), for the catalyzed reaction compared to the uncatalyzed reaction?

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