## State functions

Nhat Anh Cao 1C
Posts: 14
Joined: Fri Sep 25, 2015 3:00 am

### State functions

What are some other examples of state functions?

Chem_Mod
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### Re: State functions

Enthalpy, Entropy, Internal Energy, Potential Energy, etc.

Kayti Luu 2B
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

### Re: State functions

I understand that in a state function what matters is the initial and final, not the path that it takes, but why isn't heat a state function when enthalpy and enthalpy is a measurement of heat?

Ronald Yang 2F
Posts: 86
Joined: Fri Sep 25, 2015 3:00 am

### Re: State functions

Hey Kayti,

It's because the path heat takes does matter, since heat is a "transfer" of energy. It only exists during a change, not at the beginning and end of a change.

AngelinaArianaAviles3G
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

### Re: State functions

Hi Kayti,
Heat isn't a state function, it is a path function.
While enthalpy refers to the heat transferred or absorbed in a chemical reaction, it is done so at a constant pressure so the only final and initial are held in to account to calculate the enthalpy of a reaction. Enthalpy is a state property because it can be added.

Also, just as a side note, heat and work are considered the non-state functions. And as professor Lavelle stated, enthalpy, entropy, potential energy, etc. are state functions.

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

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