ΔG= ΔH -TΔS






Moderators: Chem_Mod, Chem_Admin

Tamera Scott 1G
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am

ΔG= ΔH -TΔS

Postby Tamera Scott 1G » Tue Feb 19, 2019 8:15 pm

Should you convert all the units into kJ/mol in the beginning of the problem or can you wait until the end when solving for ΔG with ΔG= ΔH -TΔS?

Camille Marangi 2E
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: ΔG= ΔH -TΔS

Postby Camille Marangi 2E » Tue Feb 19, 2019 8:37 pm

As long as both the enthalpy and entropy are joules/mol, you can wait until after calculations to convert to KJ/mol.

Vincent Li 4L
Posts: 48
Joined: Fri Sep 28, 2018 12:19 am

Re: ΔG= ΔH -TΔS

Postby Vincent Li 4L » Tue Feb 19, 2019 9:02 pm

In most cases, if you have to calculate change in entropy and change in enthalpy separately before using the Gibbs Free Equation, entropy tends to be in J/mol whereas enthalpy tends to be in kJ/mol. When calculating each of the constituent thermodynamic values, it doesn't really matter if it's in J/mol or kJ/mol as long as it's consistent. When using the actual delta G equation, it is important, however, to either convert both to kJ/mol or J/mol before getting the final answer.


Return to “Gibbs Free Energy Concepts and Calculations”

Who is online

Users browsing this forum: No registered users and 1 guest