Ok, i think i understand what you said, thank you very much.
This is where we started to get stuck.
"The dimerization reaction for NO
2 is: 2NO
2 N
20
4. :delta: G
Fº(NO
2)= 51Kj/mol, :delta: G
Fº(N
2O
4)= 98Kj/mol. Considering that G
r (free energy of the system) depends only in the quantity of substance (n) and the values for :delta: G
Fº, i.e. G
r=n
NO2.:delta: G
Fº(NO
2) + n
N2N04.:delta: G
Fº(N
2O
4) and suposing the proccess beginning with 20 mols of reactant and 0 mols of product and in the end there is just product (100%) write G
r=f(z) and layout the graph G
r versus z. Using the data for the end state and the start state, calculate :delta: G
r in the conditions previously described and also calculate :delta: G/ :delta: z (what relationship this represents in the graph?). Find a expression to :delta: G
r=f( :delta: z)."
As you can see, now its a little complicated.
For
Gr
f = 0 + 10 .98 = 980 Kj/mol
Gr
i = 20. (51) + 0 = 1020 Kj/mol
:delta: G
r = 980 - 1020 = -40Kj/mol
Gr = f(z)
Gr = (20 - 2z).:delta: G
Fº(NO
2) + (0-z).:delta: G
Fº(N
2O
4) (as you said i will have a positive z here, so...)
Gr = 1020 - 102z + 98z
Gr = 1020 - 4z (
is this correct?)
If this is correct the graph Gxz will be a straight line?
So here, i will have :delta: z = 10 and :delta: G / :delta: z = -40/10 = -4?
What would mean the relationship between :delta: g/ :delta: z (including the graph).
I also having dificulties to find the last expression asked.
I am missing something or i don´t know..
ps: I apreciate your book suggestion and already research for it, but i live in Brazil and don´t have access...