This channel is a gold mine. Glad I stumbled upon it.
@PhysicalChemistry3 жыл бұрын
Nuggets of PChem knowledge are definitely as valuable as gold... Glad you found your way here
@vesselab Жыл бұрын
you are such an excellent teacher
@PhysicalChemistry Жыл бұрын
Thanks, that's very kind of you
@denismitov19333 жыл бұрын
Your explanations are excellent Greetings from Serbia
@PhysicalChemistry3 жыл бұрын
Zdravo! Glad you like them
@mattthelearner27973 жыл бұрын
albania strong and homophobic
@Bulayla14267 ай бұрын
Long live Bosnia
@liberatusmpaka3847 Жыл бұрын
thanks sir for your nice presentation
@PhysicalChemistry Жыл бұрын
My pleasure. Thanks for the comment
@MuhammadKhairulIzhambinMatNor10 ай бұрын
very informative sir
@mortezakhoshbin3 жыл бұрын
Hello dear prof stuart. at the 2:14 moment why none of the boxes are left empty. is it impossible to be some empty boxes as Free Volume? however there must be some free volumes which can be thought as empty boxes.thanks alot for your explanation in advance 🌹🌹🌹
@PhysicalChemistry3 жыл бұрын
A liquid sits on the bottom of the container, and any free (gas) space is above the liquid. So the lattice, in this case, just represents the sites at the bottom of the container, which are occupied by the solution. It is certainly possible to develop a lattice model that includes empty boxes, representing free space. See this video, for example: kzbin.info/www/bejne/mYTCgZeflpygr6M But if the model allows molecules to occupy all boxes, with empty space below them, it's a model of a gas, rather than a liquid.
@mortezakhoshbin3 жыл бұрын
@@PhysicalChemistry Thanks alot. but i have a problem because it seems be a solid without having empty boxes between liquid molecules.empty cells can provide moving probablity for molecules
@PhysicalChemistry3 жыл бұрын
This model doesn't specify any mechanism for *how* the molecules can change places. We just assume that they can. Remember that it is the *ideal* solution model. In other words, the simplest model possible, like the ideal gas model is the simplest model possible for a gas. You could certainly complain that real gas molecules aren't infinitely small with no interactions, like the ideal gas model claims they are. And you'd be right. But that's not the point of the ideal gas model. You could develop a more complicated model for gases, which would be more accurate, but would also be more difficult to solve. The simple model is good enough for some purposes, and explains *why* gases expand, etc. Similarly, you could design a more accurate model of solutions, that includes mechanisms for diffusion, etc. It might be more accurate, but the ideal solution model is good enough for explaining the energy and entropy of mixing similar solvents. "Make your models as simple as possible, but not simpler."
@mortezakhoshbin3 жыл бұрын
@@PhysicalChemistry Thanks alot for your complete answer 🌹🌹🌹🙏
@serinaafk34713 жыл бұрын
thanks a lot for the explanation it helped me a lot
@PhysicalChemistry3 жыл бұрын
Great, I'm glad it helped
@shanthala13452 жыл бұрын
Thank you sir
@PhysicalChemistry2 жыл бұрын
You're quite welcome
@akashsunil7464 Жыл бұрын
proffesor wouldn't it be change in entropy is zero because changing arrangements or microsystems would be changing entropy so changing microsystems in this case would mean the change in entropy is zero in the ideal solution sytem.
@PhysicalChemistry Жыл бұрын
Your questions are subtle ones: I like them Entropy is often tricky because you have to specify clearly which micro/macro state you're discussing. You're right that each *micro*state in an ideal fluid is equally likely. But we can't really discuss the entropy of a single microstate. Entropy is used to discuss macrostates, or collections of microstates. If we're distinguishing between "unmixed" and "mixed" fluids, then there a lot more microstates that we would describe as "mixed" than microstates that we would describe as "unmixed". So the entropy of mixing is positive. For a concrete example of ideal fluids mixing on a lattice model, see this video: kzbin.info/www/bejne/rGi4q4apl610o9k
@akashsunil7464 Жыл бұрын
@@PhysicalChemistry oh I get it each microsystems value of entropy will be different as it is not the same components