QQuestionChemistry
QuestionChemistry
The standard molar enthalpy of formation for oxygen gas, O
2
(g), is zero. The enthalpy of formation for atomic oxygen, O(g), is + 250 kJ/mol. Why is there a difference?
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Answer
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Step 1I'll solve this problem step by step, explaining the reasoning behind the difference in standard molar enthalpies.
Step 2: Understand the Given Information
- Standard molar enthalpy of formation for O₂(g) = 0 kJ/mol - Standard molar enthalpy of formation for O(g) = + 250 kJ/mol
Final Answer
The difference in standard molar enthalpies (0 kJ/mol for O₂ vs. + 250 kJ/mol for O) is due to the energy required to break the strong oxygen-oxygen double bond, converting molecular oxygen into individual oxygen atoms.
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