Of the following gases, which is the most likely to be the closest to a true ideal gas? Note that a perfectly ideal gas does not exist, but many gases come close.

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Quizplus · Accepted Answer

Hydrogen gas at 0.1 atmospheres and 400 K is the closest out of the listed gases to a real ideal gas. The ideal gas law assumes that the gas molecules have no interaction, which is not true in a real situation. However, at low pressures and high temperatures, this is very nearly true because the number of gas molecules is few and less likely to collide. Water vapor is a very non-ideal gas because water has a strong dipole moment, meaning it has strong polar interactions with nearby molecules.

Of the Following Gases, Which Is the Most Likely to Be