J.R. S. answered 10/02/17
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H2O2(aq) ==> 2 H+(aq) + 2 e- + O2(g) [x5]
MnO4-(aq) + 8 H+(aq) + 5 e- ==>Mn++(aq) + 4 H2O(l) [x2]
6 H+(aq) + 5 H2O2(aq) + 2 MnO4-(aq) ==> 2 Mn++(aq) + 5 O2(g) + 8 H2O(l)
MnO4-(aq) + 8 H+(aq) + 5 e- ==>Mn++(aq) + 4 H2O(l) [x2]
6 H+(aq) + 5 H2O2(aq) + 2 MnO4-(aq) ==> 2 Mn++(aq) + 5 O2(g) + 8 H2O(l)