For a first-order reaction at $25\,^oC$,the half-life period is $248\,s$. What is the value of the rate constant at this temperature?
- A$2.8 \times 10^{-3}\,s^{-1}$
- B$2.46 \times 10^{-4}\,s^{-1}$
- C$3.46 \times 10^{-4}\,s^{-1}$
- D$4.62 \times 10^{-4}\,s^{-1}$
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