Why is enthelpy of combustion 0Kjmol-1 for oxygen

Click For Summary
SUMMARY

The enthalpy of combustion for oxygen is defined as 0 KJ/mol because oxygen is a natural element that does not undergo a combustion reaction. When considering the enthalpy change for combustion, it is essential to recognize that combustion involves the burning of a substance in excess oxygen, and since oxygen itself does not burn, its enthalpy change remains zero. This concept is crucial for understanding thermodynamic principles in chemistry.

PREREQUISITES
  • Understanding of thermodynamics and enthalpy concepts
  • Familiarity with combustion reactions and their definitions
  • Knowledge of standard states and conditions in chemistry
  • Basic grasp of chemical equations and energy changes
NEXT STEPS
  • Study the principles of thermodynamics in detail
  • Learn about standard enthalpy changes of formation
  • Explore combustion reactions of various substances
  • Investigate the role of oxygen in chemical reactions
USEFUL FOR

Chemistry students, educators, and anyone preparing for exams related to thermodynamics and combustion reactions will benefit from this discussion.

Daniel2244
Messages
125
Reaction score
5

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.
 
Physics news on Phys.org
By definition I would say. II doesn't burn, it stays unchanged.
 
  • Like
Likes   Reactions: Daniel2244
Borek said:
By definition I would say. II doesn't burn, it stays unchanged.
That makes sense. Thanks for the help.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
Replies
5
Views
3K
  • · Replies 2 ·
Replies
2
Views
7K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
1
Views
3K
  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 1 ·
Replies
1
Views
4K
  • · Replies 1 ·
Replies
1
Views
5K