Advertisements
Advertisements
प्रश्न
Obtain the expression for half-life and rate constant of the first-order reaction.
Advertisements
उत्तर
k = `2.303/t log_10 [A]_0/[A]_t`
Where, `[([A]_0 = "Initial concentration"),([A]_t = "Final concentration")]`
At, t = `t_(1/2), [A]_t = [A]_0/2`
k = `2.303/t_(1/2) log_10 [A]_t/([A]_0/2)`
k = `2.303/t_(1/2) xx log_10 2`
= `2.303/t_(1/2) xx 0.3010`
`t_(1/2) = 0.693/k`
APPEARS IN
संबंधित प्रश्न
Answer the following in brief.
Obtain the relationship between the rate constant and half-life of a first-order reaction.
What are pseudo-first-order reactions?
How will you represent first order reactions graphically.
Derive the integrated rate law for the zeroth order reaction.
Answer the following in brief.
Give one example and explain why it is pseudo-first-order.
Time required for 100% completion of a zero order reaction is _______.
Rate constant of a reaction is 3.6 × 10–3 s–1. The order of reaction is ______.
The rate of catalysed reaction is large than the uncatalysed reaction as _______.
What is half life of first order reaction if time required to decrease concentration of reactants from 0.8 M to 0.2 M is 12 hours?
Write units of rate constants for:
- First-order reaction
- Zero-order reaction
For a first order reaction \[\ce{A ->Product}\] with initial concentration x mol L−1, has a half life period of 2.5 hours. For the same reaction with initial concentration `("x"/2)` mol L−1 the half life is
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
Give two examples for zero order reaction.
Identify the order for the following reaction.
Radioactive disintegration of 92U238
The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?
The rate of the reaction \[\ce{A + B -> C}\] is 3.6 × 10−2 mol dm−3 s−1 when [A] = 0.3 mol dm−3 and [B] = 0.2 mol dm−3. Calculate k if reaction is first order in A and zero order in B.
A first order reaction has rate constant 1 × 10−2 s−1. What time will, it take for 20 g or reactant to reduce to 5 g?
A reaction that is of the first order with respect to reactant A has a rate constant 6 min−1. If we start with [A]0 = 0.5 mol dm−3, when would [A] reach the value 0.05 mol dm−3?
The time of completion of 90% of a first order reaction is approximately ____________.
Reaction given below follows first order kinetics:
\[\ce{2N2O2 -> 4NO2 + O2}\]
Calculate the rate constant of reaction if concentration of N2O2 is 0.05 M and rate of reaction is 1.5 × 10−6 mol L−1 s−1?
For a first order reaction, \[\ce{A -> B}\], if [A] = 1 M and rate is 4 × 10−2 M s−1. What is the rate constant of the reaction?
A first order reaction takes 40 minutes for 30% decomposition. What is the half-life of reaction?
0.0210 M solution of N2O5 is allowed to decompose at 43°C. How long will it take to reduce to 0.0150 M?
(Given k = 6.0 × 10−4 sec−1)
For the first order reaction A → B, the rate constant is 0.25 s-1, if the concentration of A is reduced to half, the value of rate constant will be ________.
The expression to calculate time required for completion of zero order reaction is ______.
Define the half-life of a first-order reaction.
If the rate constant for a first-order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
What are integrated rate laws?
