Question about reaction rate.

[pfaction]

TBR 9.4:

What is the reaction order for the following one step reaction:

2 NO2 -> 2NO + O2

So obviously it's going to be rate = k[NO]^2 is second order.

But what about the rate itself? Would it be, -1/2[NO]^2 = (1/2)[NO^2] = [O]?

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[chiddler]

which means that you do not consider order in this way of writing the rate equation. only depends on stoichiometric coefficient.

 

[pfaction]

Really, because there was a question on TPR's exams and I derived this directly from there.
2A -> 2B + C

= -1/2[A] = (1/2) + [C]


It's also heavy during TBR Ch 9 Gen Chem.

 

[chiddler]

I don't see how that contradicts the equation I posted.

Can you please explain? I'm not seeing it.

 

[SaintJude]

Yeah, pfaction, it's saying the same things as chiddler is saying.

 

[MedPR]

I concur.