define order of reaction. how does order of reaction differ from molecularity for a complex reaction ?

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Solution

Dear Student
The sum of exponents to which the concentration terms in rate law equation are raised to express the observed rate of reaction is called as order of reaction.
Molecularity is the number of atoms,ions ,molecules that must collide with one another simultaneously.Molecularity can be calculated by simply adding molecules of slowest step.It is always a whole number.It is applicable only to elementary reactions while order is applicable to elementary as well as complex reactions.
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Similar questions

Q. Which of the following statements are correct?

(i) Law of mass action and rate law expressions are same for single step reaction.
(ii) Order of the slowest elementary reaction of a complex reaction gives the order of the complex reaction.
(iii) Both order and molecularity have normally a maximum value of 3.
(iv) Molecularity of a complex reaction

A + 2 B \to C

is 3.

Q. Assertion :Complex reaction takes place in different steps and the slowest step determines the rate of reaction. Reason: Order and molecularity of a reaction are always equal.

For a complex reaction ......... .

(a) order of overall reaction is same as molecularity of the slowest step
(b) order of overall reaction is less than the molecularity of the slowest step
(c) order of overall reaction is greater than molecularity of the slowest step
(d) molecularity of the slowest step is never zero or non-integer

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

Q. Write two differences between 'order of reaction' and 'molecularity of reaction'.

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