### Constants in Van’t Hoff Equation

Posted:

**Sun Feb 23, 2020 9:47 pm**Are deltaS and deltaH considered constant when comparing a reaction at two different temperatures, or are other variables in the equation constant?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=136&t=60135

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Posted: **Sun Feb 23, 2020 9:47 pm**

Are deltaS and deltaH considered constant when comparing a reaction at two different temperatures, or are other variables in the equation constant?

Posted: **Sun Feb 23, 2020 9:50 pm**

Yes, delta S and delta H are assumed to not be temperature-dependent, meaning constant, when using the vant hoff equation

Posted: **Sun Feb 23, 2020 9:50 pm**

In the Van’t Hoff Equation, deltaS and deltaH are constant when comparing the same reaction at two different temperatures.

Posted: **Sun Feb 23, 2020 9:52 pm**

In the Van't Hoff equation, both deltaS and deltaH are assumed to be constant independent of temperature, however, only deltaH shows up in the most easily usable form of the equation.

Posted: **Sun Feb 23, 2020 11:41 pm**

The entropy and enthalpy are different at different temperatures but their delta's are the same.