Understanding Real Gas Behavior: Deviations from Ideal Gas Equation

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SUMMARY

The discussion focuses on the behavior of real gases, specifically air mixtures primarily composed of nitrogen and oxygen, as they deviate from the ideal gas equation at low temperatures. At temperatures of 90 K and 77 K, significant pressure drops occur due to the liquefaction of nitrogen and oxygen, respectively. This phenomenon is attributed to the phase change where gas molecules transition from the vapor phase to the liquid phase, resulting in a reduction of gas pressure.

PREREQUISITES
  • Understanding of the Ideal Gas Law and its limitations
  • Knowledge of phase changes and boiling points of gases
  • Familiarity with the properties of nitrogen and oxygen
  • Basic thermodynamics concepts related to temperature and pressure
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  • Research the phase transition of gases and its impact on pressure
  • Study the liquefaction processes of nitrogen and oxygen
  • Learn about real gas behavior using Van der Waals equation
  • Explore the implications of temperature on gas behavior in thermodynamics
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Students and professionals in chemistry, physics, and engineering fields, particularly those studying thermodynamics and gas behavior under varying temperature conditions.

rumaithya
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If you had continued to reduce the temperature of your real gas in this experiment (air mixture of mostly nitrogen and oxygen) to lower and lower temperatures, you would observe sudden drops in pressure at 90 K and 77 K. In other words, the behavior of the real gas would deviate significantly from the predicted straight-line behavior of the ideal gas equation determined in Question 3 and your extrapolated graph. Why ? [Hint: Consider what happens to water vapor(H2O(g)) when it is cooled to 0.0 C.]

Could anyone explain this, please ?
 
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Question 3

Where is this mysterious question 3...
 
Phase change

The temperatures 77 & 90 °K correspond to the liquefaction (boiling points) of Oxygen & Nitrogen respectively.

The pressure drops due to the removal of gas molecules from the vapour phase into the more condensed phase of liquid.
 

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