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AP Chemistry
5.10 Multistep Reaction Energy Profile
5.6 Reaction Energy Profile
AdvancedMCQGraphicalConceptual19.3k
A potential energy profile graph is displayed on a grayscale coordinate system. The vertical axis is labeled 'Potential Energy (kJ/mol)' with horizontal gridlines and numeric ticks at 0, 10, 20, 30, 40, 50, 60, and 70. The horizontal axis is labeled 'Reaction Progress'. A single solid black curve represents the three-step pathway: it starts at a horizontal plateau at 40 kJ/mol labeled 'Reactants', rises to a first maximum at 70 kJ/mol labeled 'TS_1', descends to a first minimum at 10 kJ/mol labeled 'I_1', rises to a second maximum at 65 kJ/mol labeled 'TS_2', descends to a second minimum at 30 kJ/mol labeled 'I_2', rises to a third maximum at 50 kJ/mol labeled 'TS_3', and finally descends to a horizontal plateau at 0 kJ/mol labeled 'Products'. No other curves, labels, text, or annotations appear.
Potential energy profile for the three-step reaction mechanism.
The potential energy profile for a three-step reaction mechanism is shown in the graph below.

Based on the profile, which of the following correctly ranks the relative rates of the forward elementary steps from fastest to slowest at a constant temperature, and provides the correct justification?

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