Question

half life and completion time of the reaction a---->2b are if initial concentration of A is 1M. k =0.001M/min
1)500 min , 1000 min
2)500 sec, 750 sec
3)500 sec, 1000 sec
4)250 min, 500 min

Answer 1

Answer:

1) 500min

2)1000min

Explanation:

From the unit of rate constant given in the question the order of reaction is zero.

The half life of the reaction will be calculated using the formula:

$t_{\frac{1}{2}}=\frac{[A_{0}]}{2k}$

Given

$[A_{0}]=1M\\k=0.001\frac{M}{min}$

Putting values

$t_{\frac{1}{2}}=\frac{1}{2(0.001)}=500min$

The reaction will not complete, however from the given options the reaction will completed to 75% in 1000min.