Question

The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.54 M? The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.54 M? 4.7 s 0.49 s 1.0 s 1.3 s 1.8 s

Answer 1

The half life time of first order reaction is 1.3 sec

Step-by-step explanation:

Given:

First order rate constant
`K = 0.54`
`M^(-1) s^(-1)`

Initial concentration
`= 0.54` M

From the formula of first order half life time,

`K = \frac{0.693}{t_{(1)/(2) } }`

So half life time is given by,

`{t_{(1)/(y2) } } = (0.693)/(0.54)`

`{t_{(1)/(y2) } } = 1.3` sec

Therefore, the half life time of first order reaction is 1.3 sec.