Order of a Reaction – The total number of reacting species (atoms, ions or molecules) whose cocentration actually changes during the course of a chemical reaction. For general reaction, aA + bB + cC → Products. It rate = k(A)<sub>a</sub> (B)<sub>b</sub> (C)<sub>c</sub> (rate equation) where K is rate constant. Then order of reaction = (a + b + c) Order of a reaction can be determined only experimentally and it is not a theoretical concept.

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