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Question

What is the value of half-life of a first-order reaction?


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Solution

Half-life for a first-order reaction:

  • “The half-life of a reaction is the time in which the concentration of a reactant is reduced to one-half of its initial concentration”
  • It is represented as t1/2.
  • For the first-order reaction, the half-life is expressed as:

t1/2=0.693k, where k is the rate constant.

  • The half-life period is constant, i.e., it is independent of the initial concentration of the reacting species.
  • On increasing the initial concentration, the half-life remains unchanged for first-order reactions.

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