Question

The rate constant for a first order reaction whose half life is 480 sec is

• A. $2.88\times {10}^{-2}{s}^{-1}$
• B. $1.44\times {10}^{-3}{s}^{-1}$
• C. $1.44s^{-1}$
• D. $0.72\times {10}^{-3}{s}^{-1}$

Answer 1

The correct option is B $1.44\times {10}^{-3}{s}^{-1}$

$k=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{480}=1.44\times {10}^{-3}{s}^{-1}$