Reaction Enthalpy vs. Enthalpy of Formation

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Abigail Yap 2K
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Reaction Enthalpy vs. Enthalpy of Formation

Postby Abigail Yap 2K » Sun Jan 14, 2018 2:10 am

Hello,

Can someone please clarify the differences between reaction enthalpy and enthalpy of formation? Thanks!

Annalise Eder 2L
Posts: 49
Joined: Sat Jul 22, 2017 3:01 am

Re: Reaction Enthalpy vs. Enthalpy of Formation

Postby Annalise Eder 2L » Sun Jan 14, 2018 11:12 am

The reaction enthalpy is the heat taken up or given off during a reaction which is the difference in enthalpies between the products and the reactants. The enthalpy of formation is the change in enthalpy between elements in their standard states to the compound they form.

905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

Re: Reaction Enthalpy vs. Enthalpy of Formation

Postby 905022356 » Sun Jan 14, 2018 12:39 pm

A reaction enthalpy refers to the total heat emitted or absorbed by any chemical reaction at a constant pressure. The enthalpy of formation of a substance X refers to the change in heat that takes place when one mol of X is formed by its constituent elements in their standard states. In other words, reaction enthalpies concern any reaction while enthalpies of formation concern the formation of one mol of one specific substance.


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