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Standard Reaction Enthalpy

Posted: Sun Jan 14, 2018 2:39 pm
by Isita Tripathi 2E
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?

Re: Standard Reaction Enthalpy

Posted: Sun Jan 14, 2018 6:23 pm
by Rachel Formaker 1E
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)