The reaction $N_{2}O_{5} \longrightarrow 2NO_{2} + \frac{1}{2}O_{2}$ is first order in $N_{2}O_{5}$ having rate constant $6.2 \times 10^{-4} \ s^{-1}$. What is the value of rate of reaction when concentration of $N_{2}O_{5}$ is $1.25 \ mol \ L^{-1}$?
- A$7.75 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
- B$8.15 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
- C$4.96 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
- D$2.01 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
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