I am not a chemist. I hope I will be specific enough.
Suppose there are two chemical species A, B with the following properties:
- at temperature t<Tr, no reaction occurs between A and B (in any combination).
- at t≥Tr, A interacts with itself to create AX2, B reacts with itself to create BX2, and A and B are reacting to create AB.
- AX2, BX2 and AB are never reacting.
In experiment, we first mix A and B in temperature $t
- What amounts of AX2, BX2, and AB can be expected to be produced?
- To obtain the amounts, should probability theory be used? E.g., amount of AB equals to probability that species A, B will interact ("collide" or similar interpretation).
Assume the rates of the reactions are equal.
Answer
Well, if you assume the rates are known and the reactions' order follows from stoechiometry (e.g. if they are elementary reactions), you can put the chemical kinetics into simple equations:
dadt=−k1a(t)2−k3a(t)b(t) dbdt=−k2b(t)2−k3a(t)b(t)
(t here being time, not temperature).
Knowing initial amounts or concentrations a0=a(t=0) and b0=b(t=0), you can pretty much integrate the system to find out what happens.
Edit — solving this system for k1=k2=k3 yields the quantities of AA, AB and BB at infinite time to be as follows:
aa=a20a0+b0 ab=a0b0a0+b0 bb=b20a0+b0
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