18.5 Gibbs Free Energy and the Equilibrium Constant | General Chemistry
Chad concludes the chapter on Thermodynamics with a lesson on the relationship between Gibbs Free Energy and the Equilibrium Constant. The lesson begins with a discussion of the mathematical relationship between the nonstandard free energy change, the standard free energy change, and the reaction quotient.
Delta G = Delta G (standard) + RTlnQ
An example calculation of the change in Gibbs free energy under nonstandard conditions is performed. This equation also allows us to draw the following three conclusions:
1. If Q is less than K, then Delta G is negative.
2. If Q is greater than K, then Delta G is positive.
3. If Q is equal to K, then Delta G = 0.
The relationship between the standard Gibbs free energy change and the equilibrium constant is then derived from this equation.
Delta G (standard) = -RTlnK
This equation can be used to calculate the standard Gibbs free energy change at a particular temperature from the equilibrium constant, or to calculate the equilibrium constant at a particular temperature from the standard Gibbs free energy change. An example calculation of the latter is performed.
Finally, a graphical representation of Gibbs free energy vs reaction progress is presented. A number of thermodynamic quantities are identified on the graph including the standard Gibbs free energy change, nonstandard delta G, the equilibrium constant and the reaction quotient.
I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at www.chadsprep.com/chads-gener...
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00:00 Lesson Introduction
00:25 Nonstandard Gibbs Free Energy Change
07:47 Delta G = -RTlnK
18:28 Graph of Gibbs Free Energy vs Reaction Progress
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This channel has literally saved my academic career . I owe chad so much
@ChadsPrep
Жыл бұрын
Wow - glad we could help while you do the hard work. Happy Studying!
This is a gem. I was so confused during my college lecture. You fixed my issue and honestly made it interesting. Thank you sir means a lot to me!
@ChadsPrep
Жыл бұрын
You're welcome!
I really am so glad that I came across your videos. It was a difficult part for me to understand when I first hear it from the college proffesor but when I listened from you, everything make sense I can say. Thank you so much.
@ChadsPrep
Жыл бұрын
You are welcome - Happy Studying!
@harrisonmasai1032
Жыл бұрын
Am really happy with the graphical interpretation kindly get us the opposite of it when Gibbs free energy is greater than 1
“Great lesson on a topic that is frankly one of the most difficult in chemistry. I almost understood it myself.” Hallo from Italy
@ChadsPrep
2 ай бұрын
Thank you from USA.
Thank you SO MUCH, Ive learned so much from all your gen chem vids!!! i literally needed this video before my gen chem 2 final
@ChadsPrep
2 жыл бұрын
You're welcome - glad the channel is helping and I hope you do well on your final!
@iziz772
2 жыл бұрын
Terrific teaching. Textbook cannot compare to your videos for easy understanding.
Thank you so so so much! I really appreciate your videos!
@ChadsPrep
2 жыл бұрын
Glad to hear it, Roxys - you're welcome!
i am studying for a chem exam which is in 2 days. just wanted to thank you and say that i love your positive vibe. keep up the great work man
@ChadsPrep
6 ай бұрын
Thank you and wishing you the best of luck on your exam - I'm sure you will smash it :)
for understanding relationship between G° and Keq why did we firstly assume that reactant and product have same concentration then G° factor affect reaction?
There is a mistake in the study guide portion of the description on your website. PP of NH3 is written as 10.0 atm where as in the problem it was given as 100.0 atm! Just a little note :)
Thank you! This was very helpful
@ChadsPrep
Жыл бұрын
You're welcome, 83NO2!
what a great teacher you are
@ChadsPrep
3 ай бұрын
Thank you very much.
Thanks Prof Chad. I have a question though. How do we use the correlation btw deltaG0 and pKa, where we find the equation: Keq = 10^deltapKa? Thank you in advance for your attention.
@ChadsPrep
Жыл бұрын
Can you clarify your question a little further? Once you have Keq from pKa, you can use DeltaG = -RTLnKeq. As for the correlation, smaller pKa ~ stronger acid ~ Keq>1 ~ deltaG0
Wow, this is a great explanation.
@ChadsPrep
8 ай бұрын
Glad you think so!
Very good sir!
@ChadsPrep
2 жыл бұрын
Thanks!
Spectacular
@ChadsPrep
Жыл бұрын
Thank you
Thank you!
@ChadsPrep
7 ай бұрын
You're welcome!
That is so weird.. that’s exactly what we are learning right now.
@ChadsPrep
2 жыл бұрын
Hope the video helps, Will - Happy Studying!
Thank you
@ChadsPrep
10 ай бұрын
You're welcome
Good teacher
@ChadsPrep
Жыл бұрын
Thank you.
heeey that's pretty cool
@ChadsPrep
Жыл бұрын
Thanks.
Uhm..... what?
i owe you my first born son
@ChadsPrep
15 күн бұрын
Indeed! :-)