Standard Enthalpy

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Erik Buetow 1F
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Joined: Fri Aug 30, 2019 12:15 am

Standard Enthalpy

Postby Erik Buetow 1F » Sun Jan 26, 2020 7:29 pm

What is the difference between standard reaction enthalpy and standard enthalpy of formation?

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

Re: Standard Enthalpy

Postby Chris Tai 1B » Sun Jan 26, 2020 7:44 pm

Standard reaction enthalpy (deltaH) is the enthalpy of the reaction that occurs when all the reactants and products are in their standard state at 1 atmosphere.
Standard enthalpy of formation (deltaHf) is the standard reaction enthalpy (deltaH) for the formation of one mole of a substance from its elements in their most stable form.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Standard Enthalpy

Postby Justin Quan 4I » Mon Jan 27, 2020 8:58 am

To add on, the reaction enthalpy is the heat given off or taken up for the reaction; hence, the enthalpy difference between the reactants and products. The enthalpy of formation is formation of a compound from its elements in their most stable states: temperature and pressure.

Jamie Lee 1F
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

Re: Standard Enthalpy

Postby Jamie Lee 1F » Tue Jan 28, 2020 10:46 am

Standard reaction enthalpy is the heat given off or absorbed during reaction, while standard enthalpy of formation is the enthalpy change between the elements in their standard state (reactants) and the compound (product).


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