# What is the decomposition of hydrogen peroxide to generate oxygen?

$2 \textcolor{w h i t e}{l} {\text{H"_2 "O"_2 (aq) stackrel("MnO"_2)(to) 2color(white)(l) "H"_2 "O" (l) + "O}}_{2} \left(g\right)$
Two moles of hydrogen peroxide ${\text{H"_2 "O}}_{2}$ decomposes to produce two moles of water $\text{H"_2 "O}$ and one mole of oxygen gas ${\text{O}}_{2} \left(g\right)$, which then bubbles off.
Both heating and the presence of a heterolytic catalyst ${\text{MnO}}_{2}$- which provides an activation site for the reaction to proceed- can speed up this process.