Error:
Cl2 %2B Ca%28OH%292 %3D HCl %2B CaCl2 %2B Ca%28ClO3%292
^
Unexpected character ('%')Cl2 %2B Ca%28OH%292 %3D HCl %2B CaCl2 %2B Ca%28ClO3%292
^
Unexpected character ('%')