In a first order reaction `ArarrB ` if k is rate constant and initial concentration of the reactant A is 0.5 M then the half - life is :

Options

A. `("log"2)/(k) `
B. `("log"2)/(ksqrt(0.5))`
C. `(In2)/(k)`
D. `(0.693)/(0.5 k)`

Answer

C

Explanation

(C ) `t_(1//2) ` for a first order reaction is :
`t_(t//2) = (0.693)/(k) "or " = (In2)/(k)`