204RealGases

204RealGases - Non-ideal gases The ideal gas law is valid...

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Lesson 9 1 Lesson 9 Non-ideal gases • The ideal gas law is valid when intermolecular interactions can be neglected. • This is more likely to be true for non-polar gases at low pressures and high temperatures (essentially far away from condensation, since intermolecular forces in the liquid state are very significant). Lesson 9 Non-ideal gases 1 RT PV m Z RT PV m For ideal gases: For real gases: Z is called compressibility factor Generally: 0.1 < Z < 1.5. Lesson 9 Van der Waals equation Why isn’t the ideal gas law always adequate? P RT V RT PV m m When T = 0 K V m = 0 However, we know that the volume at 0 K should be equal at least to the volume of the molecules since gases do not disappear upon cooling but liquefy and then solidify.
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Lesson 9 2 Lesson 9 Van der Waals equation Therefore, RT bP b P RT RT P RT PV Z m 1 According to this equation, Z is always greater than one. However,
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This note was uploaded on 11/29/2011 for the course CHE 102 taught by Professor Simon during the Fall '08 term at Waterloo.

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204RealGases - Non-ideal gases The ideal gas law is valid...

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