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Which of the following accounts for why physical properties do not differ much among gaseous compounds?
Gases only exist at high temperatures, resulting in a different set of properties from liquids and solids.
Gases are only found in non-polar covalent compounds, so there is no dipole moment that would allow for variations in properties.
Gases are only low molar mass substances, which means the low density results in a small variation of physical properties.
The relative distance between gas molecules is so large that there are virtually no intermolecular forces, resulting in little variation in physical properties.