What is the value of the rate constant for a first-order reaction if the slope for the graph of rate versus concentration is $2.5 \times 10^{-3}$?
- A$2.5 \times 10^{-3} \ s^{-1}$
- B$5.0 \times 10^{-3} \ s^{-1}$
- C$7.5 \times 10^{-3} \ s^{-1}$
- D$1.25 \times 10^{-3} \ s^{-1}$
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