Entropy Changes in Electrolytic/Galvanic Cell?

AI Thread Summary
The discussion centers on the interpretation of the equation Δ_rH_m^⦵ = Δ_rG_m^⦵ + TΔ_rS_m^⦵ in the context of electrolytic and galvanic cells. It highlights the roles of enthalpy, Gibbs energy, and entropy in chemical reactions, emphasizing that the entropy change is primarily due to differences in the structure and aggregate states of reactants and products, rather than heat exchange. The conversation also touches on the van't Hoff equilibrium box, which is presented as a tool for understanding reversible reactions and the thermodynamics involved. Participants express confusion over the relationship between entropy changes and heat exchange, asserting that the two concepts should not be conflated. The thread concludes with a suggestion to explore the van't Hoff equilibrium box for deeper insights into these thermodynamic principles.
  • #51
Dario56 said:
Yes, these two are connected somehow. Entropy change because of reaction has to do something with reversible change between states 1 and 2 as you mentioned. What is BSL?
In ChE, is Bird, Stewart, and Lightfoot, Transport Phenomena not a major resource and text any more? I referred to it extensively during my career at DuPont.
 
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  • #52
Chestermiller said:
In ChE, is Bird, Stewart, and Lightfoot, Transport Phenomena not a major resource and text any more? I referred to it extensively during my career at DuPont.
It is. I didn't recognize the acronym. You worked at DuPont? I've heard of that company.
 
  • #53
Chestermiller said:
In ChE, is Bird, Stewart, and Lightfoot, Transport Phenomena not a major resource and text any more? I referred to it extensively during my career at DuPont.
I have one more question which is how do we determine sign convention of additional work (electrical work in galvanic/electrolytic cell)? I guess we say that electrical work is positive if surroundings does work on system increasing Gibbs energy of system/reaction. So, electrical work is positive in electrolytic cell where Gibbs energy of reaction increases and negative in galvanic cell? So, electrical work has the same sign as change of G of reaction. Did I explain this correctly?
 
  • #54
Dario56 said:
I have one more question which is how do we determine sign convention of additional work (electrical work in galvanic/electrolytic cell)? I guess we say that electrical work is positive if surroundings does work on system increasing Gibbs energy of system/reaction. So, electrical work is positive in electrolytic cell where Gibbs energy of reaction increases and negative in galvanic cell? So, electrical work has the same sign as change of G of reaction. Did I explain this correctly?
It depends on the sign convention. In ChE, work done on the surroundings is usually taken as positive.
 

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