Question

The half life period for a first order reaction is 69.3s. Its rate constant is

• A. ${10}^{-2}{s}^{-1}$
• B. ${10}^{-4}{s}^{-1}$
• C. $10s^{-1}$
• D. ${10}^2{s}^{-1}$

Answer 1

The correct option is A ${10}^{-2}{s}^{-1}$

$K=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{69.3}={10}^{-2}{s}^{-1}$