Sir Chet here in this example it says ,For n moles of a constant composition mixture and integration is at constant composition. Does that mean we can't use this equation of fugacity coefficient for a system where there is change in composition occurring ?
Also, We know that Partial molar...
I was actually super confused because of this above thing that I attached .
Can we conclude that
1)Air is a homogeneous phase with constant composition , liquid water or liq vapor separately taken are pure substances also separately they are homogeneous phase with constant composition while...
That is we can say air is homogeneous phase right? And Sir what's is the difference between a substance of homogeneous phase with constant composition and Pure substance.
I have a doubt from post#3 of this thread , you said homogeneous phase is the one where material is spatially uniform. Does that mean water and water vap mixture is a homogeneous phase? If not please give me one or two examples of homogeneous phase.
So can we conclude that the only requirement to use this equation of Total Gibbs free energy change
d(ng)=(nv)dp - (ns)dT.
is that the system must be closed or if its open system then the Molar Gibbs free energy will remain constant provided the composition is constant .
I have two doubts here on:
1)
In the first line of picture I uploaded it says consider a closed system consisting of two phase in equilibrium . That means we talking about two different phases where our species is being transferred from one to another, that is it isn't a system of homogeneous...
Then how we do use this equation during a phase change operation and say as temperature and pressure is constant ,gibbs free energy change is 0.
Here is what I'm making out , that we apply dg(vapour) separately and dg(liquid) separately and for total change we do , dg= dg(vap) +dg(liq) , and...