Half-life period of a first order reaction is 100 min. After 144.3 min, concentration of reactant is reduced to … of the original concentration

Options

A. `40%`
B. `30%`
C. `1//e`
D. `1//e^(2)`

Answer

C

Explanation

`t_(Av) = (1)/(k) = (t_(1//2))/(0*693) = 1+443) t_(1//2)`
` = 1*443 xx 100 min = 144*3 min`
average life is the time in which the concentration is reduced to 1/e of the original concentration.