Question

List the various differences between Order and Molecularity of a reaction

Answer 1

Answer:

Molecularity :-  

*  The number of ions or molecules that take part in the rate-determining

step is known as molecularity.

*  It is always a whole number.

*  The molecularity of the reaction is determined by looking at the reaction mechanism.

*  The molecularity of the reaction is obtained by the rate-determining step.

Order :-

*  The sum of powers to which the reactant concentrations are raised in the rate law equation is known as the order of the reaction.

*  It can either be a whole number or a fraction.

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

*  The order of the reaction is obtained by the sum of the powers to which the reactant concentrations are raised in the rate law equation.

Answer 2

Answer:

Molecularity

• It represents the number of the reactant molecules taking part in the elementary reaction.
• It is theoretical property and indicates the number of reactant molecules involved in each act leading to the reaction.
• It is always an Integer and can never be fraction or zero.
• It is the property of only elementary reaction and has no meaning for complex reactions.

Order

• It represents the sum of the exponents to which the concentration term in the rate law are ralsed.
• It is an experimental property and Indicates the dependence of observed reaction rate on the concentration of the reactants.
• It may be an Integer, fraction or zero.
• It is property of both elementary and complex reactions

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