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AP Chemistry
6.7 Bond Enthalpies
5.10 Multistep Reaction Energy Profile
5.6 Reaction Energy Profile
Multi-Unit
IntermediateMCQGraphicalConceptual23.4k
Potential energy profile for the reaction of \(\text{NO}_2\text{(g)}\) and \(\text{CO(g)}\).
Potential energy profile for the reaction of \(\text{NO}_2\text{(g)}\) and \(\text{CO(g)}\).
The potential energy profile for a proposed two-step gas-phase reaction between \(\text{NO}_2\text{(g)}\) and \(\text{CO(g)}\) is shown below.

\[ \text{NO}_2\text{(g)} + \text{CO(g)} \rightarrow \text{NO(g)} + \text{CO}_2\text{(g)} \]

Based on the energy profile, which of the following correctly identifies the rate-determining step and provides the best explanation for why the overall reaction is exothermic?

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