Standard Reaction Enthalpy

Moderators: Chem_Mod, Chem_Admin

Isita Tripathi 2E
Posts: 52
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

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
Posts: 86
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

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)


Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests