what is the relationship b/w polarity and ideal gas behavior?

[potbelly]

Does anyone know the relationship between polarity and ideal gas behavior?

I found one question about it..

Q. Under identical conditions, which of the following gases is expected to deviate the most from ideal gas behavior?
1. Oxygen 2. Nitrogen 3. Methane 4. CO2 5. H2O

The answer is H2O...


Can anyone explain this? Thx!

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[Ryltar]

More polar = less ideal, as there would be more dipole interactions. With H2O there is also hydrogen bonding (H bonded to F, O, or N). Under ideal conditions, there are NO molecular interactions between molecules. Smaller volume = less ideal, because with smaller volume there are more molecular interactions. Thus, low temperature, and high pressure, which cause smaller volume, would not be ideal. High temperature, and low pressure, which would cause larger volume would be most ideal.

 

[potbelly]

Thanks!🙂