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Topic: Physical chemsitry Help please  (Read 4766 times)

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Offline Dj_chick

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Physical chemsitry Help please
« on: April 24, 2009, 08:23:14 AM »
The oxidation of nitric oxide shows the following characteristic

Stoichiometry: 2NO + O2 :rarrow: 2NO2

Rate Equation: d[NO2] / dt = k3[NO]2[O2]

NO + O2  ::equil:: NO3 ---------- (1)
NO3 + NO :rarrow: 2NO2----------(2)   

I.   Show that this mechanism is consistent with:
a.   the observed reaction stoichiometry
b.   the experimental equation

II.   what experiment would you carry out to check the validity of the proposed mechanism

III.   why is it unlikely that the reaction would be single step

Answers: this is how far i got with my answers but i have no idea is im right or wrong.
I.a. there is more then 1step in this reaction
I.b) d[NO2] / dt = k3[NO]2[O2] therefore 1/2 d[NO2] / dt = k2[NO3][NO] and because the NO3 is an intermeditae it  need to be eliminated this can be done by using the steady state assumption
III. does this have something to do with the molecularity


Thank you
« Last Edit: April 24, 2009, 08:46:12 AM by Dj_chick »

Offline Dj_chick

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Re: Physical chemsitry Help please
« Reply #1 on: April 25, 2009, 04:32:49 PM »
The oxidation of nitric oxide shows the following characteristic

Stoichiometry: 2NO + O2 :rarrow: 2NO2

Rate Equation: d[NO2] / dt = k3[NO]2[O2]

NO + O2  ::equil:: NO3 ---------- (1)
NO3 + NO :rarrow: 2NO2----------(2)   

I.   Show that this mechanism is consistent with:
a.   the observed reaction stoichiometry
b.   the experimental equation

II.   what experiment would you carry out to check the validity of the proposed mechanism

III.   why is it unlikely that the reaction would be single step



Thank you

[can anyone help me with this problems that will be great... :)]

Offline Dj_chick

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Re: Physical chemsitry Help please
« Reply #2 on: April 26, 2009, 03:56:27 AM »
The oxidation of nitric oxide shows the following characteristic

Stoichiometry: 2NO + O2 :rarrow: 2NO2

Rate Equation: d[NO2] / dt = k3[NO]2[O2]

NO + O2  ::equil:: NO3 ---------- (1)
NO3 + NO :rarrow: 2NO2----------(2)   

I.   Show that this mechanism is consistent with:
a.   the observed reaction stoichiometry
b.   the experimental equation

II.   what experiment would you carry out to check the validity of the proposed mechanism

III.   why is it unlikely that the reaction would be single step

Answers: this is how far i got with my answers but i have no idea if im right or wrong.
I.a. there is more 2 steps which are adding NO + O2  ::equil:: NO3 ---------- (1)
                                                          NO3 + NO :rarrow: 2NO2----------(2)   
this will give an overall equation of the stoichiometry of 2NO + O2 :rarrow: 2NO2

I.b) d[NO2] / dt = k3[NO]2[O2] therefore 1/2 d[NO2] / dt = k2[NO3][NO] and because the NO3 is an intermeditae it  need to be eliminated this can be done by using the steady state assumption

III. does this have something to do with the molecularity


Help me with any of this please.   Thank you


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