Question

The half-life of a first order reaction having rate constant $k=1.7\times 10^{-5}{s}^{-1}$ is :

• A. 12.1 h
• B. 9.7 h
• C. 11.3 h
• D. 1.8 h

Answer 1

Answer: (C)

$k=1.7\times 10^{-5}{s}^{-1}$
$t_{1/2}=\frac{0.693}{k}=\frac{0.693}{1.7\times 10^{-5}}$
$=11.3h$