## Spontaneous Reactions

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Jessica Castellanos
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Joined: Sat Aug 24, 2019 12:17 am
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### Spontaneous Reactions

How do you know if a reaction is spontaneous? Do you look at entropy or Gibbs free energy? Both?

MAC 4G
Posts: 121
Joined: Wed Sep 18, 2019 12:16 am

### Re: Spontaneous Reactions

I think you want to look at whether or not Delta G is negative for spontaneity that is accounted for entropy * T is larger than delta H.

The equation for delta G = delta H - TdeltaS
So, even if delta H and delta S are positive, increasing the temperature to make the term TdeltaS larger than delta H would then make delta G negative meaning it is spontaneous.

Maya Pakulski 1D
Posts: 105
Joined: Thu Jul 11, 2019 12:17 am

### Re: Spontaneous Reactions

You look at the value for deltaG. If deltaG is negative it is spontaneous and if it is positive it is not spontaneous. Similarly there was a question about whether a compound would be stable or unstable based on its deltaG value and if the value is negative the compound is stable, is the value is positive the compound is unstable.