Why is enthelpy of combustion 0Kjmol-1 for oxygen

AI Thread Summary
The enthalpy of combustion for oxygen is 0 KJ/mol because oxygen is a natural element that does not undergo a chemical change when burned; it remains unchanged. Since enthalpy of combustion measures the energy change when a substance is burned in excess oxygen, and oxygen itself does not burn, its enthalpy of combustion is defined as zero. This concept is crucial for understanding thermodynamic principles in chemistry. The discussion highlights the importance of definitions in thermodynamics, particularly regarding elemental substances. Understanding these principles is essential for exam preparation.
Daniel2244
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Homework Statement


Why is enthalpy of combustion 0KJmol-1 for oxygen?
I need to know this for my exam coming up soon.

Homework Equations


The enthalpy change when 1 mole of a substance is burnt in excess oxygen under standard states under standard conditions.

The Attempt at a Solution


Oxygen requires 0 energy to form as it is a natural element.
 
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By definition I would say. II doesn't burn, it stays unchanged.
 
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Borek said:
By definition I would say. II doesn't burn, it stays unchanged.
That makes sense. Thanks for the help.
 

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