Home
Class 12
CHEMISTRY
In a first order reaction, the reactant ...

In a first order reaction, the reactant concentration decreases from 0.8 M to 0.4 M in 15 min. What is the time taken for the concentration to change from 0.1 M to 0.025 M?

Text Solution

Verified by Experts

Let, `a= 0.8" M", a -x =0.4" M", t=15" min".`
For first order reaction,
`k = (2.303)/( t) log"" (1)/( a-x) = (2.303)/( 15) log"" (0.8)/( 0.4) = 0.462" min"^(-1)`
`therefore` Time taken for 0.1 M to 0.025 M can be calculated as
` t = (2.303)/( k) log"" (a)/( a-x)`
`= (2.303)/( 0.0462) log "" (0.1)/( 0.025) = 30" min"`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    ARIHANT PUBLICATION|Exercise QUESTIOS FOR PRACTICE (Part III Integrated Rate Equations) Long Answer Type Questions|11 Videos

  • CHEMICAL KINETICS

    ARIHANT PUBLICATION|Exercise QUESTIOS FOR ASSESSMENT (Part III Integrated Rate Equations) Multiple Choice Type Questions|4 Videos

  • CHEMICAL KINETICS

    ARIHANT PUBLICATION|Exercise QUESTIOS FOR PRACTICE (Part III Integrated Rate Equations) Short Answer Type I Questions|16 Videos

  • CARBOXYLIC ACIDS

    ARIHANT PUBLICATION|Exercise CHAPTER PRACTICE (LONG ANSWER TYPE QUESTIONS) |3 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    ARIHANT PUBLICATION|Exercise CHAPTER PRACTICE (LONG ANSWER TYPE QUESTIONS) |2 Videos

Similar Questions

Explore conceptually related problems

In a first order reaction, the concentration of the reactant is decreased from 1.0 M to 0.25 M in 20 minute. The rate constant of the reaction would be

For a given reaction .of first order, it takes 20 minute for the concentration to drop from 1.0 M litre^-1 to 0.6 M litre^-1 time required for the concentration to drop from 0.6 M litre^-1 to 0.36 M litre^-1 will be:

In the first order reaction , the concentration of reactant decrease from 800 mol//dm^3 to 50 mol//dm^3 in 2 xx 10^4 sec . The rate constant for the reaction is

For the reaction, R to P , the concentration of a reactant changes from 0.03 M to 0.02 M in 25 min. calculate the average rate of reaction using units of time both in minutes and seconds.