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Enthalpy of Formation and Reaction

Posted: Sun Feb 10, 2019 5:41 pm
by Semi Yoon
When is the enthalpy of formation equal to the enthalpy of the reaction? Is it only when one mole of a product is produced?

Re: Enthalpy of Formation and Reaction

Posted: Sun Feb 10, 2019 6:01 pm
by Iona Pay
Yep, that's the main difference! ∆H°, enthalpy of reaction, is the ∆H of the system when all products and reactants are in their standard states. ∆H°f, enthalpy of formation, is the ∆H of the formation of 1 mole of whatever compound when all products and reactants are in their standard states.