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Question

In what condition do order and molecularity of a reaction become equal?


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Solution

Order of reaction:

  • The order of the reaction is the connection that exists between the pace of a chemical reaction and the concentration of the species involved.
  • The rate expression of the reaction in the issue must be known before the reaction order can be determined.

Molecularity of a reaction:

  • A reaction's molecularity is defined as the number of reacting molecules that collide at the same time to produce a chemical reaction.
  • In other terms, the number of reactant molecules involved in an elementary reaction is defined as its molecularity.

Condition for which order and molecularity of a reaction are equal:

  • A reaction must be elementary in order for its order and molecularity to become equal.
  • An elementary reaction is one that happens in a single step.
  • The total of the whole reaction equation is the elementary reaction.
  • Molecularity is derived at each stage in elementary processes.
  • Consider the reaction shown below:

A+BProducts

Rateequation=[A]1[B]1

  • The order of the reaction is the sum of the coefficient of the rate equation.
  • Therefore, the order of reaction =2
  • And molecularity=2

Thus, for an equal value of order and molecularity, a reaction must be elementary.


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