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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Saturday, March 24, 2012

Arrhenius Constant

We know that the formula of Arrhenius Equation is:



We know that the Arrhenius Constant (A) is the frequency factor of the collision between particles. Know my question is: Where that equation came from?

To answer this question, we need to write a sample of reaction equation like as follows:



Okay now, we have to know that the relation between the Enthalpy Change and Activation energy is:



And the equilibrium constant of the equation above is:



First we have to write the law of the rate of equation for that reaction above:

r = k [X]

Substitute this equation with the equilibrium constant so that:



Know we connect the equilibrium constant with Gibbs Free Energy and we will get:



Now, we substitute this equation to our rate law so that:



This rate equation, k, is the same as the frequency of collision right? So that:



k' is the new rate constant (similar to the pseudoconstant), from here, we can conclude that the value of A is:



PS: kb is the Boltzmann Constant and h is the Planck Constant.


SOURCE:
Documents of Pelatnas 2 IChO 2012
Taught by: Raden Aditya Wibawa Sakti - ITB


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