For the gas phase decomposition of hydrogen peroxide at $400C$

$2H_2{O}_2$longrightarrow$2H_{2}O+O_2$

the following data have been obtained:

The average rate of disappearance of $H_2{O}_2$ over the time period from $t=16\mathrm{.}0s$ to $t=32\mathrm{.}0s$ is

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