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Question

Define the order of reaction?


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Solution

Part 1: Order of reaction:

  • The order of a chemical reaction is the sum of powers of the concentration of the reactants in the rate law expression.
  • The order of the reaction is represented by n.
  • The order of a reaction can be 0, 1, 2, 3, and even a fraction.
  • Order of reaction is an experimental concept.
  • The order of the reaction depends upon the concentration of reactants besides zero-order reaction.
  • A zero-order reaction means that the rate of reaction is independent of the concentration of reactants.

Part 2: For example, consider a reaction:

xX+yYProduct
The rate law for a given reaction is:

rate=K(X)x(Y)y

The order of reaction for the above reaction on the basis of rate law can be written as follows –

Order of reaction =x+y


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