A first order reaction is `20%` complete in `10 min`. Calculate (a) the specific rate constant of the reaction and (b) the time taken for the reaction to reach `75%` completion.

Options

A. `0.223 mi n^(-1)`
B. `0.0322mi n^(-1)`
C. `1.023mi n^(-1)`
D. `0.123 mi n^(-1)`

Answer

2

Explanation

`(i)` For the first`-` order reaction, we have
`k=(2.303)/(t)log.([A])/([A]_(0))=-(2.303)/((10mi n))log.(80)/(100)=0.0223mi n^(-1)`