Free gibbs energy doubt

  • Thread starter david22
  • Start date
  • #1
8
0
I´m having serious problems with free gibbs energy equation. My main problem is that i dont know the meaning of TΔS that appears in free gibbs formula. I know that S is entropy and T temperature; but some books say that TΔS is energy lost or dispersal energy; energy unavailable to do work; but for example, lets say that the sistem loses 30 joules of heat so ΔH will be negative because it is an exothermic reaction; and lets say that the ΔS is positive at T=25°ℂ and lets say that TΔS = 30 joules. So if we add this numers in the equation -30J - 30J = -60J so this number is the energy useful to do work so this means that TΔS is also energy that is useful to do work, so my question is why some books say that this is energy unable to do work? and if you can give me a physical interpretation of TΔS ( what kind of energy is it?) i would appreciate it
 

Answers and Replies

  • #2
DrClaude
Mentor
7,539
3,872
Hi David, welcome to PF!

Could you please provide quotes for the statement? Just saying "some books say that" is not very helpful (sometimes, conetxt is everything).

If [itex]\Delta S[/itex] is positive, it usually means that heat is entering the system from the environment, which can indeed be used for additional work.
 

Related Threads on Free gibbs energy doubt

  • Last Post
Replies
2
Views
5K
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
15
Views
4K
  • Last Post
Replies
4
Views
10K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
11
Views
981
  • Last Post
Replies
2
Views
3K
Top