Phase Changes

[Vuong_2F]

For reactions where substances are not in their most stable/standard phase, how would you account for that when calculating enthalpies?

[Christine Honda 2I]

If the substance is not in the most stable/standard phases then you must use the total of the enthalpy of the phase change and the bond enthalpy when calculating.

[Chris Charton 1B]

When the substance is not in its standard state at the given temperature, you have to add the enthalpy of its phase changes. For example if its a gas in its standard state and is currently a solid, you would have to add the enthalpy of its sublimation.

[405268063]

Yes, as the previous response said, you must add the enthalpy of the phase change.

[rohun2H]

Add the enthalpy of the phase change.

[gabbymaraziti]

You should calculate the enthalpy, then add the enthalpy of the phase change.

[Eesha Chattopadhyay 2K]

The proper method is to calculate the enthalpy, then add the enthalpy of the phase change.

[Joowon Seo 3A]

To accommodate for the phase change of the material, add the reaction enthalpy of the phase change onto the reaction.