Anonymous asked in Science & MathematicsChemistry · 4 weeks ago

gas law and ideal gas?

are you thinking about Ideal Gas Law equation is a valid approximation of real gas or ideal gas behavior or should the van der Waals equation always be used instead? Please explain for me

2 Answers

  • 4 weeks ago

    depends on the accuracy you need, and on the gas and conditions. 

    Best to use van der Waals equation for most accuracy. Or do both and look at the difference. 

    ideal gas equations tend to fail at higher pressures and for gases with a high molecular weight.

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  • 4 weeks ago

    That would depend on what you were trying to calculate.

    Van der Waals equations come into play when the gas is being compressed enough that individual particles' real sizes or interactions with each other become a non-negligible factor in the results.  If that's not the case, then the Ideal Gas Law is a valid approximation.

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