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

$2$ H$2$O$2($g$)2$ H$2$O$($g$)+$ O$2($g$)$

the average rate of disappearance of H$2$O$2$ over the time period from t $=0$ s to t $=6\mathrm{.}78$ s is found to be $1\mathrm{.}34\backslash$times $10-2$ M s$-1.$

What is the average rate of appearance of O$2$ over the same time period?