Standard Reaction Enthalpy

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Isita Tripathi 2E
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Joined: Sat Jul 22, 2017 3:00 am
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Standard Reaction Enthalpy

Postby Isita Tripathi 2E » Sun Jan 14, 2018 2:39 pm

Does anyone have an example of a chemical equation for which the reaction enthalpy is not the standard reaction enthalpy because one of the reactants/products isn't in standard state? I know of examples in which the phase is not the standard one at that temperature, but what about a molecule?

Rachel Formaker 1E
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Joined: Fri Sep 29, 2017 7:04 am
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Re: Standard Reaction Enthalpy

Postby Rachel Formaker 1E » Sun Jan 14, 2018 6:23 pm

Some examples of reactants or products not in their standard states is carbon as diamond (instead of graphite) or oxygen as ozone (O3 rather than O2).

So a possible example of a reaction with reactants not in standard states is the conversion of ozone into oxygen:
2O3(g) --> 3O2(g)

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