In the reaction of formation of sulphur trioxide by contact process 2 SO_2+ O_2 ⇌ 2 SO_3 the rate of reaction was measured as (d [ O_2])/dt=-2.5 ×…

In the reaction of formation of sulphur trioxide by contact process $\displaystyle 2 \mathrm{SO}_2+\mathrm{O}_2 \rightleftharpoons 2 \mathrm{SO}_3$ the rate of reaction was measured as $\displaystyle \frac{\mathrm{d}\left[\mathrm{O}_2\right]}{\mathrm{dt}}=-2.5 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$. The rate of reaction in terms of $\displaystyle \left[\mathrm{SO}_2\right]$ in mol $\displaystyle \mathrm{L}^{-1} \mathrm{~s}^{-1}$ will be :