**Half life of first order:**

Time required to consume the half of initial concentration of reactant is called half life period.

At half life time:

Thus half life period is independent of initial concentration.

Unit of rate constant is time^{-1}.

Reciprocal of rate const. (half life) is **average life**.

After ‘n’ half times the concentration A= A_{0}/2^{n}

Examples:

T_{75} = 2 ´ t_{50}. i.e. time taken to complete 75 % of reaction is twice that of half life time.

Examples of First Order Reactions:

**Half life of Nth Order Reaction:
**For n

^{th }order reaction the mathematical expression:

**Chemical Kinetics of population growth:
**

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Class 12 Chemistry Chemical Kinetics All Topics Notes CBSE Class 12 Chemistry All Chapters Notes

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