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Order of a Reaction

For a general reaction: aA + bB cC + dD.
r = k[A]a [B]b
 
where the dimensionless exponents a′ and b′ may or may not be equal to a and brespectively. The constants a′ and b′ may have positive, negative integral or fractional values or zero value. The constant a′ is known as the order of the reaction with respect to A, b′ as the order of the reaction with respect to B, and so on. The sum (a′ + b′) is known as the overall order of the reaction.
 
It may be emphasized once again here that the rate equation with its rate constant and order of various reacting species is an experimental finding and cannot be predicted from the stoichiometry of the balanced reaction.




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