alleryStart learning →For a gas showing perfectly ideal behaviour, the compressibility factor Z takes which value?
AZero exactly
BAlways above 1
COne exactly
DAlways below 1
Answer & Solution
Correct answer: C. One exactly
1. The compressibility factor compares the real molar volume of a gas with the molar volume an ideal gas would have at the same temperature and pressure.
2. If the gas behaves ideally the two volumes match and the ratio is exactly 1.
3. Any departure from 1, in either direction, signals non-ideal behaviour.
4. Real gases dip below 1 at moderate pressures because of attractions, then climb above 1 at very high pressures because of molecular volume.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.6 Non-Ideal Gas Behavior_
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