### Constant delta H

Posted:

**Sun Feb 16, 2020 11:27 pm**I am confused why delta H remains constant in the Van't Hoff equation. Can someone explain this to me please?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=136&t=59570

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Posted: **Sun Feb 16, 2020 11:27 pm**

I am confused why delta H remains constant in the Van't Hoff equation. Can someone explain this to me please?

Posted: **Sun Feb 16, 2020 11:33 pm**

Delta H remains constant in the Van't Hoff Equation, since its under the assumption that temperature changes little enough that delta H can be considered constant throughout the reaction.

Posted: **Tue Feb 18, 2020 12:13 pm**

Can we always assume that delta S naught is constant when using the Van't Hoff Equation?

Posted: **Tue Feb 18, 2020 1:43 pm**

Yes, the Vant Hoff equation can only be applied effectively under the assumption that the entropy change is independent of the temperature of the reaction. This assumption can be made unless explicitly told otherwise.

Posted: **Tue Feb 18, 2020 1:49 pm**

we are assuming the difference between the final H and initial H to remain constant, and that the temperature change isn't significant enough to affect that