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AP Chemistry
3.5 Kinetic Molecular Theory
3.4 Ideal Gas Law
IntermediateMCQDrawing RepresentationsConceptual17.1k
A single square box represents a cross section of a sealed rigid container. A legend to the right defines: small open circle = He atom; large filled circle = Ar atom. Inside the square boundary, there are exactly 6 small open circles and exactly 2 large filled circles, evenly dispersed throughout the interior space without touching each other or the boundaries. The 6 small open circles are positioned at coordinates roughly corresponding to upper-left, upper-middle, center-left, center-right, lower-left, and lower-right. The 2 large filled circles are positioned at roughly upper-right and lower-middle. No other particles, labels, text, or annotations appear.
Particulate representation of a mixture of \(\text{He(g)}\) and \(\text{Ar(g)}\) at \(300 \text{ K}\).
A rigid, sealed \(1.0 \text{ L}\) container holds a mixture of helium, \(\text{He(g)}\), and argon, \(\text{Ar(g)}\), at thermal equilibrium at \(300 \text{ K}\). A particulate representation of the mixture inside the container is shown in the diagram.

Which of the following statements correctly compares the average kinetic energy of the gas atoms and explains the relative partial pressures of \(\text{He(g)}\) and \(\text{Ar(g)}\) in the container?

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