AP Chemistry
3.6 Deviation from Ideal Gas Law
3.1 Intermolecular and Interparticle Forces
In a gas-recovery study, a student places separate samples containing identical numbers of gas molecules into identical rigid vessels at the same temperature. The vessels are maintained at high pressure, and both samples remain single phases. The student calculates the compressibility factor, defined as \(Z=\dfrac{PV}{nRT}\). For an ideal gas, \(Z=1\).
Which choice ranks the gases from greatest to least magnitude of deviation from ideal behavior and best explains the ranking?
| Gas | Molecular description | Measured \(Z\) |
|---|---|---|
| \(\text{CH}_4\) | Tetrahedral and nonpolar | \(0.96\) |
| \(\text{SO}_2\) | Bent and polar | \(0.72\) |
Which choice ranks the gases from greatest to least magnitude of deviation from ideal behavior and best explains the ranking?
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