 # Difference Between Order And Molecularity

tl;dr
Order is a measure of the rate of a reaction, while molecularity is a measure of the number of molecules involved in a reaction. Order is a measure of the rate of a reaction, and molecularity is a measure of the number of molecules involved in a reaction. Order is expressed as a whole number, such as first order, second order, and so on. Molecularity is expressed as a fraction, such as 1/2, 1/3, and so forth.

Order is used to describe the rate at which a reaction is occurring, while molecularity is used to describe the number of molecules involved in a reaction. For example, a first order reaction is one that is occurring at a rate proportional to the concentration of the reactants, while a second order reaction is one that is occurring at a rate proportional to the square of the concentration of the reactants.

Molecularity is also used to describe the number of molecules involved in a reaction. A reaction with a molecularity of 1/2 involves two molecules, while a reaction with a molecularity of 3/2 involves three molecules. The number of molecules involved in a reaction can affect the rate at which the reaction occurs, as well as the products that are formed.

In summary, order is a measure of the rate of a reaction, while molecularity is a measure of the number of molecules involved in a reaction. Order is expressed as a whole number, while molecularity is expressed as a fraction. The number of molecules involved in a reaction can affect the rate at which the reaction occurs, as well as the products that are formed.