Error:
H2O %2B KMnO4 %2B NaNO2 %3D KOH %2B MnO2 %2B NaNO3
^Unexpected character ('%')H2O %2B KMnO4 %2B NaNO2 %3D KOH %2B MnO2 %2B NaNO3
^Unexpected character ('%')