Question about stability of Ozone

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    Ozone Stability
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SUMMARY

The discussion centers on the thermodynamic properties of ozone (O3) formation, specifically its positive enthalpy of formation and negative entropy change, leading to a positive Delta G at all temperatures. This indicates that the formation of ozone is non-spontaneous under standard conditions. However, the participants clarify that while the reaction is non-spontaneous, it can still occur with an equilibrium constant that favors the formation of O2. The conversation emphasizes the distinction between spontaneity and equilibrium in chemical reactions.

PREREQUISITES
  • Understanding of thermodynamics, specifically enthalpy and entropy concepts.
  • Familiarity with Gibbs free energy (Delta G) calculations.
  • Knowledge of chemical equilibrium and the equilibrium constant (K).
  • Basic principles of spontaneous processes in chemistry.
NEXT STEPS
  • Research the relationship between Gibbs free energy and equilibrium constants in chemical reactions.
  • Study the implications of positive Delta G in non-spontaneous reactions.
  • Explore the concept of spontaneity in thermodynamics and its practical applications.
  • Investigate the formation and stability of ozone in atmospheric chemistry.
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Chemistry students, researchers in thermodynamics, and professionals in atmospheric science interested in the properties and behavior of ozone.

Kshitij Kabeer
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The enthalpy of formation of O3 is positive. Change in entropy for the formation of O3 is also negative( as the number of gaseous moles is decreasing). This means that Delta G is positive for all temperatures. So formation of ozone should be non spontaneous at all temperatures. Then how does it exist?
 
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Have you looked at the expression for the equilibrium constant?
 
You mean Delta G=-RTlnK? Yes. So you mean to say that the reaction still occurs but equilibrium favours formation of O2. OK I get your point, So now my question is why do we say the reaction is non spontaneous when Delta G is positive? What is the meaning of spontaneity?
 

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