Error:
KMnO4 %2B NaOH %3D O2 %2B K2MnO4 %2B Na2MnO4 %2B H2O
^
Unexpected character ('%')KMnO4 %2B NaOH %3D O2 %2B K2MnO4 %2B Na2MnO4 %2B H2O
^
Unexpected character ('%')