Distinguish between order of a reaction and molecularity of a reaction?

The main difference between the order of a reaction and molecularity of a reaction are given below:



It is sum of the concentration terms on which the rate of reaction actually depends or it is the sum of the exponents of the concentrations in the rate law equation. It is the number of atoms, ions or molecules that must collide with one another simultaneously so as to result into a chemical reaction.
It need not be a whole number i.e. it can be fractional as well as zero. It is always a whole number.
It can be determined experimentally only and cannot be calculated. It can be calculated by simply adding the molecules of the slowest step.
It is for the overall reaction and no separate steps are written to obtain it. The overall molecularity of a complex reaction has no significance. It is only slowest step whose molecularity has significance for the overall reaction.
Even the order of a simple reaction may not be equal to the number of molecules of the reactants as seen from the unbalance equation. For simple reactions, the molecularity can usually be obtained from the Stoichiometry of the equation.

Category: Chemical Kinetics

More Questions

11 Responses to " Distinguish between order of a reaction and molecularity of a reaction? "

  1. Emmanuel Noble says:

    I was preparing for an exam. I then searched tru the Google and I discovered your. I found d resouces dere helpful and useful.

  2. sohan aryal says:

    Thank you very much.

  3. Prasanta swain says:

    TheBigger.com notes are very nice.

  4. Uche Noble says:

    I found this very resourceful and self explanatory especially now my exam is just at the corner…Thanks.

  5. deepak says:

    It is good and can be understood with ease.

  6. Hamid Qasba says:

    Good notes

  7. Samuel Asuquo says:

    Gives me the tips i required for writing my assignment. Thanks to you guys

  8. Felix Rwegasira says:

    thanks very much,,,the language used is so easy to understand

  9. bunt shunt says:

    this topic was there in the books but now it has been eliminited….thanks for giving the concept!

  10. Ayuba Mustapha says:

    wow, tnks. Afta much sweat, it’s self explanatory, tnx.

  11. anthom sanni says:

    very helpful and useful

Leave a Reply

Comment moderation is enabled. Your comment may take some time to appear.

Copyright © All rights reserved. TheBigger.com | Privacy Policy | Contact Us | Copyright Policy | Useful Resources