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Maybe you meant hydrogen peroxide and manganese dioxide?

in that case,

hydrogen peroxide: H2O2
manganese dioxide: MnO2

(H2O2) (MnO2) = (H2O) + (O2)


 H2O2  ^(raised to)-2 MnO2 =  H2O + O2 [also written as]
 H2O2 {-2}MnO2 =  H2O + O2

otherwise, i may not be correct, sorry.
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