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Donna Nguyen 2L
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Postby Donna Nguyen 2L » Tue Feb 11, 2020 12:55 am

How does Gibbs Free Energy relate to spontaneity?

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Re: Spontaneity

Postby alex_4l » Tue Feb 11, 2020 1:18 am

When delta G is negative = it is spontaneous in the forward direction and non-spontaneous in the reverse direction
When delta G is 0 = this is equilibrium so the reaction is reversible, this means that the rate of the forward reaction is equal to the rate of the reverse reaction
When delta G is positive = the reaction is non-spontaneous in the forward direction and spontaneous in the reverse direction

Hope that helps!

kim 2I
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Re: Spontaneity

Postby kim 2I » Tue Feb 11, 2020 2:25 am

An exothermic reactions is spontaneous because it results in an increase of entropy of the surroundings. If you think of the equation △Gr= △Hr-T △Sr, when △Hr is large enough and negative compared to △Sr, the Gibbs Free Energy would be negatvie and therefore making the reaction spontaneous.

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Re: Spontaneity

Postby preyasikumar_2L » Tue Feb 11, 2020 2:49 am

△G < 0 means that the forward reaction is spontaneous, exothermic
△G = 0 means that the reaction is at equilibrium, reversible
△G > 0 means that the forward reaction is not spontaneous, endothermic

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