## Equilibrium

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

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

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

Vanessa Rojas 4F
Posts: 15
Joined: Wed Feb 20, 2019 12:17 am

### Equilibrium

Why is delta G naught 0 at equilibrium?

Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

### Re: Equilibrium

At equilibrium, the system does not have a preference for the forward or reverse rxn, so neither would spontaneously occur

alicechien_4F
Posts: 104
Joined: Sat Jul 20, 2019 12:15 am

### Re: Equilibrium

At equilibrium, the forward and reverse reactions occur at the same rate. This means that neither reaction is favored, and so neither reaction is spontaneous.

Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

### Re: Equilibrium

Vanessa Rojas 4F wrote:Why is delta G naught 0 at equilibrium?

When delta G is negative, the reaction is spontaneous.
When delta G is positive it is not spontaneous, but you could think of the reverse reaction to be favored.

So, when delta G is negative, there is not a preference to proceed to products, nor is there a favoring of the reverse reaction, thus the reaction is at equilibrium.

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

### Re: Equilibrium

Vanessa Rojas 4F wrote:Why is delta G naught 0 at equilibrium?

By definition, equilibrium is when the forward and backward reaction rates are equal. If delta G naught is 0, this means that the thermodynamic potential is the same of both the reactants and products. As such, there is no favorable direction the reaction must proceed in (as both reactants and products have equal thermodynamic ability), which means that the reaction is in equilibrium.

ayushibanerjee06
Posts: 177
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

### Re: Equilibrium

if you use the deltag=-nrtlnK equation, it will equal zero because, at equilibrium, K=1 and ln(1)=0.

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

### Re: Equilibrium

At equilibrium, the forward and reverse reactions are at the same rate. This means that no reaction is favored as G is not positive or negative, meaning that the reaction is not spontaneous

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

### Re: Equilibrium

So when a reaction is at equilibrium, delta G is equal to 0. The only way delta G naught is also equal to zero is if K = 1.

Andres Merlos 2L
Posts: 46
Joined: Wed Sep 18, 2019 12:17 am

### Re: Equilibrium

Neither reverse nor forward reaction is favored at equilibrium, so at delta G naught 0, the reaction is neither spontaneous nor non-spontaneous. This would mean neither reaction is favored, so it would be at equilibrium.

Vinita Saxena 2I
Posts: 58
Joined: Fri Aug 09, 2019 12:16 am

### Re: Equilibrium

When delta G is 0 there is no preference to products or reactants, so it is at equilibrium.

Daria MacAuslan 1H
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Joined: Sat Aug 17, 2019 12:16 am

### Re: Equilibrium

At equilibrium, we know that both the forward and reverse reactions are occurring at roughly the same rate, and with roughly the same favorability. This means that neither one is specifically favored or spontaneous, so delta g is 0

rohun2H
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

### Re: Equilibrium

Neither reaction is favored at equilibrium.

205389184
Posts: 100
Joined: Sat Sep 07, 2019 12:18 am

### Re: Equilibrium

Since both the forward and reverse reactions are occurring at the same rate in equilibrium, delta G naught would be equal to zero

Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

### Re: Equilibrium

Delta G is zero at equilibrium because the concentrations of products and reactants are not changing and neither the forward nor reverse reaction is favored; given that the system isn't doing work, there is nothing that would cause a change in free energy of the system.

Viviana Velasquez
Posts: 97
Joined: Sat Jul 20, 2019 12:15 am

### Re: Equilibrium

Since K=1 at equilibrium and the equation is RTln(K), ln(1)=0 making Delta G=0

Jessica Kwek 4F
Posts: 29
Joined: Mon Jan 06, 2020 7:57 am

### Re: Equilibrium

At equilibrium, delta G would be 0 since the reactants and products are occurring at the same rate, which means that the reaction favors neither side.