## ΔSº and ΔHº question

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

Chloe Thorpe 1J
Posts: 77
Joined: Fri Sep 28, 2018 12:16 am

### ΔSº and ΔHº question

Why can we assume that ΔSº and ΔHº are constant in the Van't Hoff Equation?

Mindy Kim 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:25 am

### Re: ΔSº and ΔHº question

Generally, the change in enthalpy or entropy do not change with temperature. The standard entropies and enthalpies may be different for the compounds, but the change in enthalpy or entropy for the reaction does not vary significantly with change in temperature.

Tuong Nguyen 2I
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Been upvoted: 1 time

### Re: ΔSº and ΔHº question

Yes only free energy can be greatly influenced by a change in temperature.

LeannaPhan14BDis1D
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Joined: Fri Sep 28, 2018 12:16 am

### Re: ΔSº and ΔHº question

Free energy is the one that changes and is influenced by temperature

Celio_G_Dis2C
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Joined: Fri Jan 11, 2019 12:16 am

### Re: ΔSº and ΔHº question

T will mostly affect free energy only. One might think that it also changes enthalpy because the addition of heat will change the forward/irreversible reactions of an equation but the change is minimal

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

### Re: ΔSº and ΔHº question

The change in delta S and delta H is negligible with a change in temperature so we assume they are constant.