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Real Gases: Deviations from Ideal Behavior

Real gas particles... . 1) . 2) . Real Gases: Deviations from Ideal Behavior. All real gases deviate, to some degree, from PV = nRT. The deviations are most pronounced at. high P and/or low T. DO occupy space . DO experience attractive forces. correction for particle attraction.

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Real Gases: Deviations from Ideal Behavior

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  1. Real gas particles... 1) 2) Real Gases: Deviations from Ideal Behavior All real gases deviate, to some degree, from PV = nRT. The deviations are most pronounced at... high P and/or low T. DO occupy space DO experience attractive forces

  2. correction for particle attraction correction for particle volume ideal gas (ideal gas equation): real gas (van der Waals equation): (attraction makes P smaller than ideal gas law predicts) (particles w/SOME vol. exert a bigger P than those w/zero vol.) Johannes Diderik van der Waals (1837 – 1923)

  3. Effect of Particle Volume ideal gas particles mass m, speed v, ~NO volume real gas particles mass m, speed v, YES volume shorter mean free path = more collisions/sec. **GREATER pressure than PV = nRT predicts

  4. The constants a and b are unique for each gas. -- a is large when interparticle attractions are large -- b is large for large gas particles a and b both tend to increase with mass e.g., both are larger for Xe than for Ne

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