How do I know which enthalpy change to calculate?

  • #1
Physicsman788
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How do I know if I need to find the enthalpy of combustion or the enthalpy of formation? I know the equation to find the enthalpy change of each them but I dont know on a question if I have to find the enthalpy of combustion or the enthalpy of formation.
 

Answers and Replies

  • #2
Borek
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It must depend on the question, there is no "one size fits all" answer.
 
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  • #3
Lord Jestocost
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The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one mole of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state.

https://www.chemguide.co.uk/physical/energetics/definitions.html
 

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