Real Gases at Low vs. High Pressure

[justadream]

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Are these statements true?

1) At high pressure, Volume of Real Gas > Volume of Ideal Gas. This is because the molecules of gas start taking up non-negligible volume.

2) At low pressure, Volume of Real Gas < Volume of Ideal Gas. This is because of the attractive intermolecular forces between molecules.

 

[mehc012]

Are these statements true?

1) At high pressure, Volume of Real Gas > Volume of Ideal Gas. This is because the molecules of gas start taking up non-negligible volume.

2) At low pressure, Volume of Real Gas < Volume of Ideal Gas. This is because of the attractive intermolecular forces between molecules.

Statement 1 is definitely true.
Statement 2, however, is meh. It is generally assumed that under low pressure conditions, there are fewer interactions between molecules, period.

It is more:
At high pressure, Vreal > Videal because of non-negligible volumes.
At low temperature, Vreal <Videal because of IMFs (assuming attractive IMFs...the opposite would be true if, say, it was an ionized gas and they had the same charges)

Otherwise, the two Vs should be similar, and at sufficiently low pressure AND high temperature, Vreal should approach Videal