## Constant delta H

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

### Constant delta H

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

Kimberly Koo 2I
Posts: 99
Joined: Sat Aug 17, 2019 12:17 am

### Re: Constant delta H

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.

Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

### Re: Constant delta H

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

Naji Sarsam 1F
Posts: 104
Joined: Sat Aug 17, 2019 12:18 am

### Re: Constant delta H

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.

Sally Qiu 2E
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

### Re: Constant delta H

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