Consider the Conversion of Ozone, O₃, to Oxygen, O₂, and This

question 44

Multiple Choice

Consider the conversion of ozone, O₃, to oxygen, O₂, and this reaction's corresponding thermodynamic data:
2 O₃ (g) →3 O₂ (g) D H ° = - 286 kJ/mol and D S ° = 137 Jmol ^{- 1}K ^{- 1} At what approximate temperature does this reaction cross-over from being considered spontaneous to being non-spontaneous?

• A) It won't cross over. It will always be spontaneous.
• B) It won't cross over. It will always be non-spontaneous.
• C) 149 K
• D) 208 K
• E) 479 K

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