Order of a reaction

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Order of a reaction: 

 Order of a reaction may be defined as - the sum of the power (coefficient) of the concentration terms of the reactants occurring in the rate determining step of a chemical reaction. Consider the following general reaction. 
                      aA + bB ---> products
                      Rate = k [A]a × [B]b 
Order of the reaction = a + b 
     
   The order of a reaction can only be determined from experiment. Thus, order of reaction is defined as the sum of powers raised on concentration terms in order to write rate expression from experimental evidences. 

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