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### Topic: Fraction of argon gas at 400k energy > 10kJ  (Read 4404 times)

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#### Zamzen

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##### Fraction of argon gas at 400k energy > 10kJ
« on: April 27, 2011, 04:47:30 AM »
Hi all!

Question states:
Calculate the fraction of atoms in a sample of argon gas at 400k that have an energy of 10kJ or greater.

I have NO ide how to tackle this problem. It is a question in my chemical kinetics chapter. What i do know is the avarage kinetic energy formula Wk=RT*3/2 where R is the gas constant 8.31 T is the absolute temperature. From there I do not know how to proceed.

#### Schrödinger

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##### Re: Fraction of argon gas at 400k energy > 10kJ
« Reply #1 on: April 27, 2011, 06:20:24 AM »
Usually, such fractions are calculated using the Boltzmann distribution : for the fractional number of particles Ni/N occupying a set of states i possessing energy Ei, Ni is proportional to $$e^{(-E_{i}/(k_{B}T))} /$$
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#### Zamzen

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##### Re: Fraction of argon gas at 400k energy > 10kJ
« Reply #2 on: April 29, 2011, 10:39:15 PM »
Thank you!!!