Spontaneity in the Gibbs Eqn






Moderators: Chem_Mod, Chem_Admin

Nico Edgar 4L
Posts: 32
Joined: Fri Sep 28, 2018 12:19 am

Spontaneity in the Gibbs Eqn

Postby Nico Edgar 4L » Wed Feb 20, 2019 3:01 pm

If a reaction has negative delta H and negative delta S, will it be spontaneous at high or low temperatures??

2c_britneyly
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

Re: Spontaneity in the Gibbs Eqn

Postby 2c_britneyly » Wed Feb 20, 2019 3:14 pm

It will be spontaneous at a low temperature.

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

Re: Spontaneity in the Gibbs Eqn

Postby Hedi Zappacosta 1E » Wed Feb 20, 2019 3:34 pm

Just look at the equation delta G=delta H - T delta S. If you plug in the numbers and delta G is negative, then it is spontaneous.

hazelyang2E
Posts: 57
Joined: Fri Sep 28, 2018 12:23 am

Re: Spontaneity in the Gibbs Eqn

Postby hazelyang2E » Wed Feb 20, 2019 4:38 pm

If a reaction has negative delta H and negative delta S, it will be spontaneous when the absolute values of Temperature x Delta S is greater than the absolute value of delta H because delta G will also be negative.

beckyolmedo1G
Posts: 34
Joined: Fri Sep 28, 2018 12:21 am

Re: Spontaneity in the Gibbs Eqn

Postby beckyolmedo1G » Wed Feb 20, 2019 5:34 pm

When both are negative it would be spontaneous at LOW temps. If both were positive, it would be spontaneous at HIGH temps.


Return to “Gibbs Free Energy Concepts and Calculations”

Who is online

Users browsing this forum: AniP_2D and 1 guest