Question

The rate constant for a first order reaction is $6.93\times {10}^{-3}{\text{s}}^{-1}$. The Half-life period of the reaction is:

• A. $10\text{s}$
• B. $10000\text{s}$
• C. $1000\text{s}$
• D. $100\text{s}$

Answer 1

The correct option is D $100\text{s}$

For a first order reaction.,
$t_{\frac{1}{2}}=\frac{0.693}{k}=\frac{0.693}{6.93\times {10}^{-3}}=100\text{s}$