## State Function

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Erik Buetow 1F
Posts: 96
Joined: Fri Aug 30, 2019 12:15 am

### State Function

Are we able to use Hess's law to help determine Gibbs free energy because they are both state functions or is there a separate reason?

Kaylee Sepulveda 4G
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Joined: Thu Jul 11, 2019 12:16 am

### Re: State Function

Gibbs free energy is a state function since it's defined in terms of thermodynamic properties that are also state functions. Hess's law can be used for both changes in entropy and in Gibbs free energy.

JohnWalkiewicz2J
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### Re: State Function

Yeah pretty much, since ΔG= ΔH - TΔS and all those components are state functions, you could assume ΔG is also a state function.

Cavalli_1H
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### Re: State Function

hess's law can also be applicable to gibbs free energy for the reason of it being a state property

Mariana Fuentes 1L
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### Re: State Function

You can use it. You just have to make sure you arrange the equations to be equal to delta G.

DesireBrown1J
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### Re: State Function

Cavalli_1H wrote:hess's law can also be applicable to gibbs free energy for the reason of it being a state property

How is it explained and applied to Gibbs free energy?

Megan Vu 1J
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Joined: Thu Jul 25, 2019 12:15 am

### Re: State Function

Hess's law can be applied to Gibb's equation because Gibb's is a state function.

Because they are state functions, they are able to be added or subtracted together since the pathway is not dependent on them. In this, Gibbs is able to be added or subtracted when given specific equations of formation or any other values. This is why calculating the enthalpy through the Hess' Law is similar to calculating Gibb's.

JesseAuLec1Dis1G
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Joined: Mon Jun 17, 2019 7:23 am

### Re: State Function

Since it is a state function it is not path dependent. This is why we can use Hess's law, because the pathway doesn't matter just the end results.