A Level Chemistry Revision "Enthalpy Cycles involving Standard Enthalpy Changes of Combustion"

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[@ironknight3041]

Sir, could you please explain why C and H have an enthalpy change less than 0? because in the previous video you said elements cannot have an enthalpy change and that they will remain 0.

[@Freesciencelessons]

I think you might be confusing enthalpy change of formation and enthalpy change of combustion. Elements, such as carbon and hydrogen have an enthalpy change of FORMATION of zero (because enthalpy change of formation only applies to compounds). However, we can combust both carbon and hydrogen so they can have an enthalpy change of COMBUSTION. This will be a negative number as combustion is an exothermic process. I hope that helps.

[@ironknight3041]

@@Freesciencelessons Ahh ok yep that makes more sense sir. Thank you!

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could u please recheck it I used R1 and Route 2 method and got +85

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[@Freesciencelessons]

Change the positive into a negative (or vice versa).

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