Error:
FeS2 %2B KOH %2B Cl2 %3D K2FeO4 %2B KCl %2B K2SO4 %2B H2O
^
Unexpected character ('%')FeS2 %2B KOH %2B Cl2 %3D K2FeO4 %2B KCl %2B K2SO4 %2B H2O
^
Unexpected character ('%')