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AP Chemistry
2.2 Intramolecular Force and Potential Energy
IntermediateMCQDrawing RepresentationsConceptual14.1k
A potential energy diagram showing potential energy in kJ/mol on the vertical y-axis versus internuclear distance in pm on the horizontal x-axis. The origin is at the bottom left, with the x-axis extending to the right from 0 to 300 pm and the y-axis extending upward from negative values to zero. A solid curve represents O2(g) with a potential energy minimum located at an internuclear distance of 120 pm and a depth of -495 kJ/mol. Four dashed curves labeled Curve A, Curve B, Curve C, and Curve D show alternative potential energy profiles. Curve A has its minimum at 140 pm and -945 kJ/mol. Curve B has its minimum at 110 pm and -945 kJ/mol. Curve C has its minimum at 110 pm and -200 kJ/mol. Curve D has its minimum at 140 pm and -200 kJ/mol. All curves approach zero potential energy at large internuclear distances and rise steeply at very small internuclear distances. No other curves, labels, text, or annotations appear.
Potential energy curves for diatomic molecules.
A student plots the potential energy as a function of internuclear distance for a molecule of \(\text{O}_2(g)\), shown as the solid curve in the diagram. The student then wants to plot the curve for a molecule of \(\text{N}_2(g)\). Which of the labeled dashed curves best represents the potential energy profile for \(\text{N}_2(g)\)?

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