rate law and mechanism compatiility?

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John S

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NO2 + CO --> NO + CO2

has the following rate expression at low temperatures:

Rate=k[NO2]^2

Is the following mechanism compatible with the experimental information?

1) NO2 + CO --> O-N-O-C-O(slow)
(2) O-N-O-C-O --> NO + CO2(fast)

what is best answer and why

1) Yes, the mechanism is compatible, because the mechanism sums to the overall reaction.

2) No, the mechanism is not compatible, because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

3) The compatibility of the mechanism cannot be determined from the information given.

4) Yes, the mechanism is compatible, because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

5) Yes, the mechanism is compatible, because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

6) No, the mechanism is not compatible, because the mechanism does not sum to the overall reaction.
 
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