For a substance that remains a gas under all of the conditions listed, deviation from the ideal gas law would be most pronounced at

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The deviation from the ideal gas law is most pronounced at low temperatures and high pressures, where the assumptions of the ideal gas law (negligible volume of gas molecules and no intermolecular forces) are least valid. Option D, at -100°C and 4.0 atm, represents the lowest temperature and highest pressure, conditions under which gases are most likely to deviate from ideal behavior.

For a Substance That Remains a Gas Under All of the Conditions