Question
Wed December 06, 2017 By: Yashvi Gandhi

how to identify the orders of any reaction?

Expert Reply
Varsha
Wed December 06, 2017
In the rate equation
 
Rate = K[A]x [B]y 

The x and y represents the dependence of the rate of reaction to change in the concentration of Aand B.
 
 The sum of these exponents (x + y) in the above equation gives the overallorder of a reaction.
Hence,
 
The sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction.
 
For example, if the rate expression of a particular reaction is
 
             Rate = K[A]1/2 [B]3/2 
 
Then the order of the reaction will be
 
          space Order space equals space fraction numerator space 1 over denominator 2 end fraction plus 3 over 2 space space space space space space space
space space space space space space space space space space space
space space space space space space space space space space space space space space equals space 2
space space space space space space space space space space space space space space space space
space
The reaction is of second order.
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