## molecularity

$\frac{d[R]}{dt}=-k[R]^{2}; \frac{1}{[R]}=kt + \frac{1}{[R]_{0}}; t_{\frac{1}{2}}=\frac{1}{k[R]_{0}}$

Felicia Fong 2G
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### molecularity

Do you determine the molecularity of a reaction by number of reactants? For example, if NO+NO yields N2O2 then it is bimolecular because there are two reactants?

Jakob von Morgenland 2C
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am
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### Re: molecularity

You can determine the molecularity by looking at the number of molecules that participate/are used in the rate-determining step/rate law.

aaron tang 2K
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: molecularity

Yes you do.
A -> P unimolecular
A+B -> bimolecular
A+A -> bimolecular

Kailey Brodeur 1J
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Joined: Thu Jul 27, 2017 3:00 am

### Re: molecularity

You are correct that molecularity can be determined by the reactants, but we have to remember that this concept only relates to elementary reactions and doesn't apply to overall reactions.

Renee Delamater 2H
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Joined: Wed Nov 16, 2016 3:02 am

### Re: molecularity

Even though there are only NO molecules in the problem, using 2 of the NOs makes it bimolecular.

KayleeMcCord1F
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Joined: Fri Sep 29, 2017 7:05 am

### Re: molecularity

You can determine molecularity by the number of molecules of reactants.

Arshpreet Sandhu 1B
Posts: 32
Joined: Thu Jul 27, 2017 3:00 am

### Re: molecularity

Yeah, you calculate molecularity by the number of reactants in a reaction.