Error:
KMnO4 %2B H2C2O4 %3D CO2 %2B K2O %2B MnO3 %2B H2O
^
Unexpected character ('%')KMnO4 %2B H2C2O4 %3D CO2 %2B K2O %2B MnO3 %2B H2O
^
Unexpected character ('%')