Change of State and energy

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Steven_Liu_3H
Posts: 12
Joined: Wed Sep 21, 2016 2:55 pm

Change of State and energy

Postby Steven_Liu_3H » Sun Jan 15, 2017 11:45 pm

Since water can have different energies at different states, can we have a delta_H of formation for water that is at, for example, its sublimation point?

Kareem
Posts: 18
Joined: Wed Sep 21, 2016 3:00 pm

Re: Change of State and energy

Postby Kareem » Sun Jan 15, 2017 11:51 pm

At its sublimation point, it would just be the energy of formation at water state that it is in, whether its a solid or a gas. Doesn't matter the phase change.

Chem_Mod
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Re: Change of State and energy

Postby Chem_Mod » Sun Jan 15, 2017 11:52 pm

What do you mean by water can have different energies at different states? And the enthalpies of formation are defined as the enthalpy change during the formation of one mole of a compound in its standard state. There is only one physical state water is in at standard conditions, so no.


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