RealGasesBW2 - Real Gases The gas laws we obtained from...

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•1 CHEM 1000 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 1000 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
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•2 CHEM 1000 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 CHEM 1000 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?
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•3 CHEM 1000 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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RealGasesBW2 - Real Gases The gas laws we obtained from...

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