Distinction between order and molecularity of a reaction?​

Answers 2

Molecularity Of the reaction :

➡️Molecularity is the number of ions or molecules that take part in the rate-determining step.

➡️It is always a whole number It can either be a whole number or a fraction

➡️The molecularity of the reaction is determined by looking at the reaction mechanism

➡️It is theoretical concept

➡️It is meaningful only for simple reactions or individual steps of a complex reaction.It is meaningless for an overall complex reaction

_____________________Order of the reaction :

➡️Number of molecules of the reactant whose concentration changes during the chemical change

➡️ It can either be a whole number or a fraction

➡️The order of the reaction is determined by the experimental methods.

➡️ It is experimental concept

➡️It is meant for the reaction and not for its individual steps

_________________

Note:

➡️We should note here that it is important to distinguish molecularity from order of reaction. Order of reaction is calculated by experiment from the rate law of reaction. To determine order we should sum up the exponents from the rate law of the equation.

➡️We cannot consider the molecularity of reaction, it involves a difficult mechanism. Only the molecularity of individual elementary reactions should be considered.

____________________

Be Brainly!

Answer:

The order of the reaction is the power dependence of the rate on the concentration of each reactant.

Molecularity is the number of reactants that take part in a rate-determining step.

Explanation:

The order of the reaction is the power dependence of the rate on the concentration of each reactant. This means for a first-order reaction rate is dependent only on one reactant. Second-order reaction rate dependent on two reactants or square of the concentration of single reactant.

On the other hand, molecularity is the number of reactants that take part in a rate-determining step. In the case of unimolecular reactions, there is only one reactant in the reaction. If there are 2 molecules of the reactant that participate in a reaction it is bimolecular.

Molecularity is a whole number other than zero which is between 1-3.

whereas order can be either whole number or fraction between 0-3.

Molecularity is a theoretical value and order is experimental.

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