Question

The rate of first-order reaction is `1.5 xx 10^(-2) M "min"^(-1)` at `0.5 M` concentration of reactant. The half-life of reaction is
A. `0.383` min
B. `23.1` min
C. `8.73` min
D. `7.53` min

Answer 1

Correct Answer - B
Rate `= K[A]^(1)`
`K = (1.5 xx 10^(-2))/(0.5) "min"^(-1)`
`:. t_(1//2) = (0.693)/(K) = (0.693 xx 0.5)/(1.5 xx 10^(-2)) = 23.1 min`