Question

Difference b/w order and molecularity of reaction ???

Answer 1

Order.. Is experimentally derived.. Value may be integer fractional...

But molecularity.. Nvr be more than.. 3

Answer 2

hii dear!!
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☆Order reaction of a reaction:-
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▪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 concentrationsin the rate law equation..

▪it need not be a whole number i.e. it can be fractional as well as zero..

▪It can be determined experimentally only and cannot be calculated...

▪.It is for the overall reaction and no separate steps are written to obtain it.

▪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..
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☆On the other hand:
▪Molecularity of a reaction:-
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▪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 is always a whole number.

▪It can be calculated by simply adding the molecules of the slowest step.

▪The overall molecularity of a complex reaction has no significance. It is only slowest step whose molecularity has significance for the overall reaction..

▪For simple reactions,the molecularity can usually be obtained from the Stoichiometry of the equation..
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