Error:
K2MnO4 %2B CO2 %2B H2O %3D KHCO3 %2B MnO2 %2B KMnO4
^
Unexpected character ('%')K2MnO4 %2B CO2 %2B H2O %3D KHCO3 %2B MnO2 %2B KMnO4
^
Unexpected character ('%')