Molecularity and the Coefficient of an Elementary Step


Moderators: Chem_Mod, Chem_Admin

Hannah Guo 3D
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

Molecularity and the Coefficient of an Elementary Step

Postby Hannah Guo 3D » Mon Mar 05, 2018 8:19 pm

Is there any association between the molecularity and the coefficient of an elementary step. For example, when the molecularity is termolecular, does it mean that the coefficients of the reactants in a balanced elementary step add up to be 3?
Thank you!

Julie Steklof 1A
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Molecularity and the Coefficient of an Elementary Step

Postby Julie Steklof 1A » Mon Mar 05, 2018 9:59 pm

Molecularity is the number of species involved in an elementary step. So yes, for example a termolecular elementary step would have to have three reactants colliding which is seen in a reaction in which the stoichiometric coefficients add up to three.

Yixin Angela Wang 2H
Posts: 51
Joined: Thu Jul 27, 2017 3:00 am

Re: Molecularity and the Coefficient of an Elementary Step

Postby Yixin Angela Wang 2H » Mon Mar 05, 2018 10:00 pm

Yes, I believe that's correct. Molecularity is the number of reactants in a particular step, so for example a reaction that requires 2 molecules of one compound and 1 molecule of another would be 2A+B--->product, and it should be termolecular.


Return to “Reaction Mechanisms, Reaction Profiles”

Who is online

Users browsing this forum: No registered users and 1 guest