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Topic: unimolecular and bimolecular  (Read 3538 times)

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Offline _cheers

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unimolecular and bimolecular
« on: February 23, 2007, 04:29:25 PM »
In doing some problems on elementary steps and rate laws....

2NO -> N202
2H2 -> 4H
N202 + H -> N20 + HO
2HO + 2H -> 2H20
H + N20 -> HO + N2

over= 2NO + 2H2 -> 2H20 + N2

question: why is 1) bimolecular when 2) is not and why is the rate law squared in 1 and not 2, 4?

probably a simple answer, but I just started reading this ...

thanks!
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Offline Kelvin

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Re: unimolecular and bimolecular
« Reply #1 on: February 23, 2007, 04:58:29 PM »
I think the second elementary step can be reduced to H2 --> 2H.

Offline vhpk

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Re: unimolecular and bimolecular
« Reply #2 on: February 24, 2007, 05:09:07 AM »
I think (2) is bimolecular because there is a shock between 2 H2.
I think the rate law squared in (1) maybe because (1) is a slow stage
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