A substance, X, undergoes a first order ...

A substance, X, undergoes a first order reaction `XrarrY` with a half life of 20 minutes. If the initial concentration of X is `2.0` M, what will its concentration be after 40 minutes?

A

`0.25` M

B

`0.50` M

C

`1.0` M

D

`1.4` M

Text Solution

Verified by Experts

The correct Answer is:

B

Topper's Solved these Questions

CHEMICAL KINETICS
GRB PUBLICATION|Exercise D. Methods to Determine the Rate Law|28 Videos
CHEMICAL KINETICS
GRB PUBLICATION|Exercise E. Methods to Monitor the Progress of Reaction|43 Videos
CHEMICAL KINETICS
GRB PUBLICATION|Exercise B. Rate Law|35 Videos
CHEMICAL BONDING-I
GRB PUBLICATION|Exercise Subjective Type|120 Videos
COORDINATION COMPOUNDS
GRB PUBLICATION|Exercise SBJECTIVE TYPE|98 Videos

Similar Questions

Explore conceptually related problems

For the first order reaction half-life time is ………….. on the initial concentration.

In a first-order reaction A rarr B , if K is the rate constant and initial concentration of the reactant is 0.5 M , then half-life is

The half-life period of a first order reaction is 10 minutes. Starting with initial concentration 12 M, the rate after 20 minutes is

The half-life period of a second order reaction is "30" minutes.If the initial concentration is 0.1M ,the rate constant will be :-

For a first order reaction, if ‘a’ is the initial concentration of reactant, then the half life time is

In a first order reaction, A rarrB , if K is rate constant and initial concentration of the reactant A is 0.7M then half - life is

Half life of a first order reaction is 4s and the initial concentration of the reactant is 0.12 M. The concentration of the reactant left after 16 s is

For a first order reactions, the half -life is 10 mins. How much time in minutes will it take to reduce the concentration of reactant to 25% of its original concentration ?

GRB PUBLICATION-CHEMICAL KINETICS-C. Integrated Rate Laws

Number of natural life times (T(av)) required for a first-order reacti...
Text Solution
|
For a zero order reaction and a Ist order reaction half life are in ra...
Text Solution
|
A first order reaction has a rate constant of 0.0541s^(-1) at 25^(@)C....
Text Solution
|
For a first order chemical reaction : A rarr P. The correct statement(...
Text Solution
|
Which does not change with time for a first-order reaction?
Text Solution
|
At a given temperature, a first-order reaction has a rate constant of ...
Text Solution
|
Which statement about second order reactions is correct?
Text Solution
|
For the reaction A rarr B that is first-order in A, The rate constant ...
Text Solution
|
A substance, X, undergoes a first order reaction XrarrY with a half li...
Text Solution
|
For reaction, A rarr B, the rate law is rate = k[A]. If the reaction i...
Text Solution
|
What is the half life of the irreversible first order reaction, A rarr...
Text Solution
|
The first-order disappearance of a substance has a half-life of 34.0 s...
Text Solution
|
The rate of dicomposition of a certain compound in solution is first o...
Text Solution
|
Which change will decrease the rate of the reaction between I(2)(s) an...
Text Solution
|
What is the first-order rate constant for the reaction that is 36.5% c...
Text Solution
|
The half-life of a first-order reaction is 1.5 hours. How much time is...
Text Solution
|
What are the units for the rate constant of a zero-order reaction?
Text Solution
|
For a first order reaction A rarr B, find [(t(7//8))/(t(1//2))].
Text Solution
|
For the zero order reaction : A rarr P, K=10^(-2)("mol"//"litre")sec...
Text Solution
|
Which is constant for different reactant concentrations in a first-ord...
Text Solution
|