Physical Chemistry lecture that introduces the Helmholtz and Gibbs Free Energies. The general definitions are given as well as their differential expressions.
Thank you for your explanation. I didn’t know the difference and relation between Helmholtz free energy and Gibbs free energy precisely although I learned them in thermodynamics. But I begin to understand after listening your explanation.
When we simplify p*dV are we assuming equilibrium? The external pressure which does work on the system might be different from the internal pressure of the system.
Great question, and this is a point of confusion for many students. The Gibbs energy is defined by the differential given in the video dG = -SdT + VdP. Delta G is usually measured at constant T and P because under those conditions dG = 0, the system is at equilibrium and we know the Gibbs energy will be at a minimum.
@@ProfessorDerricotte that makes sense, thank you so much for the explanation! Your videos are really helping me as I take pchem so thank you for that too!
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Thank you for your explanation. I didn’t know the difference and relation between Helmholtz free energy and Gibbs free energy precisely although I learned them in thermodynamics. But I begin to understand after listening your explanation.
When we simplify p*dV are we assuming equilibrium? The external pressure which does work on the system might be different from the internal pressure of the system.
PV-work takes place when there's a change in volume while the external pressure remains constant so we can assume mechanical equilibrium
Thank you very much! Very well explained
Thank you man
Don’t we define delta G at constant pressure and delta A at constant volume? So why do we have the dP and dV terms respectively?
Great question, and this is a point of confusion for many students. The Gibbs energy is defined by the differential given in the video dG = -SdT + VdP. Delta G is usually measured at constant T and P because under those conditions dG = 0, the system is at equilibrium and we know the Gibbs energy will be at a minimum.
@@ProfessorDerricotte that makes sense, thank you so much for the explanation! Your videos are really helping me as I take pchem so thank you for that too!
100 👍🏻
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