According to the second law of thermodynamics, for any spontaneous process,(adsbygoogle = window.adsbygoogle || []).push({});

[itex] \Delta S_{uni}> 0 [/itex] .

And for any reversible process,

[itex] \Delta S_{uni}= 0 [/itex] .

This means that no process can be reversible and spontaneous at the same time.

However, what I don't understand is the connection to [itex]\Delta G [/itex]. Suppose I know that [itex] \Delta S_{uni}> 0 [/itex], i.e. the process is spontaneous. Can I use this equation to prove that for the system in question, [itex]\Delta G < 0[/itex]. ? Using only the definition of the terms and knowing that the process is spontaneous?

Thanks!

BiP

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Can I prove spontaneity using the entropy change?

**Physics Forums | Science Articles, Homework Help, Discussion**