Question

The rate constant for a second order reaction is 1.2 x 10—3 dm3mol—1 s —1 . If its initial concentration
of the reaction is 0.003 mol dm—3 , calculate its half-life period

Answer 1

Explanation:

For a zero order reaction,

t=

k

[A

0

]−[A]

t=30min=

2

1

hr

k=0.2moldm

−3

h

−1

[A]=0.05moldm

−3

On putting these values in the equation above, we get A

o

=0.15moldm

−3