A first order reaction is found to have rate constant, \(k = 3.5 × 10^{-4} s^{-1}\). Its half life will be:
Answer & explanation
Correct answer: option 1
The correct answer is option 1. \(198 × 10 s\).
Given,
Rate constant for the first order reaction, \(k = 3.5 × 10^{-4}s^{-1}\)
We know, for a first order reaction,half-life,
\(t_{1/2} = \frac{0.693}{3.5 × 10^{-4}s^{-1}}\)
or, \(t_{1/2} = 1980s\)
or, \(t_{1/2} = 198 × 10 s\)