Question

In the first order reaction the concentration of reactants is reduced to 25% in one hour. the half life period of the reaction is

Answer 1

According to the theory of chemical reactions, in a first order reaction, the concentration of the reactant present falls by 50% after every half-life.

 

Considering that the concentration given above is 25%, we can look at it in the following way:

 

After the first half-life, concentration becomes 50%.

 

After the next half-life, it becomes half of 50% i.e., 25%.

 

Hence, in the above question, 2 half-lives have been completed. Since 2 half-lives make an hour, the half-life period of the above reaction is 30 minutes.

Answer 2

30 minutes is your answer........