Spontaneous Reactions

Volume:
Temperature:

Moderators: Chem_Mod, Chem_Admin

Jessica Castellanos
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

Spontaneous Reactions

Postby Jessica Castellanos » Mon Feb 10, 2020 3:31 pm

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

Postby MAC 4G » Mon Feb 10, 2020 3:52 pm

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

Postby Maya Pakulski 1D » Mon Feb 10, 2020 4:03 pm

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.


Return to “Entropy Changes Due to Changes in Volume and Temperature”

Who is online

Users browsing this forum: No registered users and 1 guest