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AP Chemistry
5.10 Multistep Reaction Energy Profile
5.6 Reaction Energy Profile
AdvancedMCQGraphicalMathematicalConceptual15.7k
Draw a grayscale potential-energy graph on bare axes with no gridlines. Label the vertical axis “Potential energy (\(\text{kJ/mol}\))” and the horizontal axis “Reaction coordinate.” A single solid black curve begins at a horizontal reactant plateau labeled \(\text{X(g)}\), rises to the first and highest peak labeled \(\text{TS}_1\), falls to a local minimum labeled \(\text{I}\), rises to a lower second peak labeled \(\text{TS}_2\), and ends at a horizontal product plateau labeled \(\text{Y(g)}\) below the reactant level. Add exactly \(4\) vertical double-headed arrows: reactant level to first-peak height, \(75\text{ kJ/mol}\); product level to first-peak height, \(105\text{ kJ/mol}\); intermediate level to second-peak height, \(40\text{ kJ/mol}\); product level to second-peak height, \(90\text{ kJ/mol}\). Use short dashed horizontal guides only at arrow endpoints. Place arrows outside the curve. No legend or other text appears.
Measured potential-energy profile for the reversible \(\text{X(g)} \rightleftharpoons \text{Y(g)}\) pathway.
A student studies the reversible gas-phase isomerization

\[ \text{X(g)} \rightleftharpoons \text{Y(g)} \]

The proposed pathway contains \(2\) elementary steps, and measured activation-energy differences are shown in the potential-energy profile. Based on the graph, which value and reasoning correctly give \(\Delta H_{\text{forward}}\)?

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