Constants

[Caroline Cox 1H]

Can someone explain to me why we can assume that deltaH and deltaS are constant when using the Van't Hoff equation to calculate K at different temperatures?

[Anh Nguyen 2A]

Because the values of enthalpy and entropy at different temperature are different but the difference between the final value and initial value is the same no matter what the temperature so we can assume that deltaH and deltaS are constant at different temperature.

[Ilan Shavolian 1K]

im pretty sure since they are state functions, they can be considered constant

[nathansalce 3e]

Technically, we do not assume that deltaH and deltaS are constants... but rather we assume the difference in deltaH and deltaS between the two equations (for the two temperatures) is the same.Thus, we say that the rate at which H and S change is not the same, but the difference between the two values is the same at both temperatures, allowing us to compare other values at the two temperatures.

[Abby Ellstrom 1I]

The change in enthalpy and entropy does not change between different temperatures in this equation so they can be treated as constant.