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AP Chemistry
9.4 Thermodynamic and Kinetic Control
AdvancedMCQConceptual21.5k
A reaction energy profile graph plotted on Cartesian axes with a vertical axis labeled Potential Energy and a horizontal axis labeled Reaction Coordinate without gridlines. A horizontal line segment at the left represents reactant \(\text{R}\). From \(\text{R}\), two distinct reaction pathways branch. Pathway 1, drawn as a solid curve, rises to a lower activation energy peak labeled \(\text{TS}_1\) and descends to a product plateau labeled \(\text{P}_1\), which lies below \(\text{R}\). Pathway 2, drawn as a dashed curve, rises to a higher activation energy peak labeled \(\text{TS}_2\) and descends to a product plateau labeled \(\text{P}_2\), which lies significantly lower in energy than \(\text{P}_1\). A double-headed arrow indicates that the activation energy barrier to \(\text{TS}_1\) is smaller than the activation energy barrier to \(\text{TS}_2\). No other curves, gridlines, labels, or annotations appear.
Reaction energy profile for the conversion of \(\text{R}\) into products \(\text{P}_1\) and \(\text{P}_2\).
A reaction coordinate diagram for two competing pathways of a reactant \(\text{R}\) forming products \(\text{P}_1\) and \(\text{P}_2\) is shown below.

Three identical sealed containers each initially receive \(0.10 \text{ mol}\) of \(\text{R}\) and are allowed to react for \(15 \text{ min}\). Sample 1 is maintained at \(220 \text{ K}\), Sample 2 is maintained at \(350 \text{ K}\), and Sample 3 is maintained at \(550 \text{ K}\).

Which of the following correctly ranks the samples from least to greatest in terms of the mole fraction of \(\text{P}_2\) present after \(15 \text{ min}\), and provides the correct justification?

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