Error:
Zn %2B Na2SO3 %2B HCl %3D ZnCl2 %2B H2S %2B NaCl %2B H2O
^
Unexpected character ('%')Zn %2B Na2SO3 %2B HCl %3D ZnCl2 %2B H2S %2B NaCl %2B H2O
^
Unexpected character ('%')