Error:
HCl %2B KMgO4 %3D H2O %2B Cl2 %2B KCl %2B MgCl2
^
Unexpected character ('%')HCl %2B KMgO4 %3D H2O %2B Cl2 %2B KCl %2B MgCl2
^
Unexpected character ('%')