Lesson_9 - Non ideal gases The ideal gas law is valid when...

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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).
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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.
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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 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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Lesson_9 - Non ideal gases The ideal gas law is valid when...

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