Gibbs free energy of formation






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Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Gibbs free energy of formation

Postby Sanjana Borle 2K » Thu Mar 05, 2020 10:25 pm

I dont understand conceptually how the standard Gibbs free energy for pure substances is also zero, like delta H standard. Since the equation for Delta G is H-TdeltaS, why doesnt the TdeltaS part factor in? Why is it still zero?

Mariah
Posts: 104
Joined: Fri Aug 02, 2019 12:16 am

Re: Gibbs free energy of formation

Postby Mariah » Fri Mar 06, 2020 11:05 am

Sanjana Borle 2K wrote:I dont understand conceptually how the standard Gibbs free energy for pure substances is also zero, like delta H standard. Since the equation for Delta G is H-TdeltaS, why doesnt the TdeltaS part factor in? Why is it still zero?


I think since it is a pure substance you assume that delta S is constant which makes that term zero.

005384106
Posts: 101
Joined: Sat Aug 24, 2019 12:16 am

Re: Gibbs free energy of formation

Postby 005384106 » Sun Mar 08, 2020 1:08 pm

How do you know if you are dealing with a pure substance?


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