Question

The rate constant of a first order reaction, where half-life is $8\min$, is:

• A. $1.44s^{-1}$
• B. $0.72\times 10^{-3}{s}^{-1}$
• C. $1.44\times 10^{-3}{s}^{-1}$
• D. $2.88\times 10^{-3}{s}^{-1}$

Answer 1

Answer: (C)

For first order reaction $t_{1/2}=\frac{0.693}{k}8=\frac{0.693}{k}$
$k=\frac{0.693}{8}=0.087{\min }^{-1}$
$=1.44\times 10^{-3}{s}^{-1}$