RealGasesC3.pdf - Real Gases The gas laws we obtained from...

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•1 CHEM 1000A 3.0 Real Gases 1 Real Gases The gas laws we obtained from experiments performed under normal conditions of temperature and pressure – Therefore we can usually use the ideal gas law Under more extreme conditions we get deviations from the ideal gas law CHEM 1000A 3.0 Real Gases 2 Compressibility factor One way to measure the deviation from ideal behaviour is to define a compressibility factor Z as: nRT PV Z = •For an ideal gas Z=1 CHEM 1000A 3.0 Real Gases 3 Compressibility factor Different gases deviate from ideal behaviour in different ways Deviation can be positive (Z>1) or negative (Z<1) Deviation always positive at sufficiently high pressure
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•2 CHEM 1000A 3.0 Real Gases 4 Compressibility factor The compressibility factor is an empirical (experimental)predict or of real gas behaviour but doesn’t tell us anything about WHY? CHEM 1000A 3.0 Real Gases 5 Van der Waal Equation This is an attempt to correct the assumptions of the kinetic theory of gases
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  • Fall '09
  • Hempstead
  • Van der Waal, DER WAAL EQUATION

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