For the gas phase decomposition of nitrogen dioxide at $383C$

$2N{O}_2$longrightarrow$2NO+O_2$

the average rate of disappearance of $N{O}_2$ over the time period from $t=0s$ to $t=18s$ is found to be $4\mathrm{.}44{10}^{-3}M{s}^{-1}.$

The average rate of formation of $O_2$ over the same time period is

$M{s}^{-1}.$

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