Third order reaction

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Third order reaction: 

In this reaction, the rate of the reaction depends upon the concentration of three reacting species.

Example: 
(1) Reaction between nitric oxide and oxygen 2NO +O --> 2NO²; rate k[NO]²[O²] 

(2) Reaction between nitric oxide and bromine  
2NO + Br² --> 2NOBr; rate = k[NO]²[Br²]

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