Error:
Zn %2B H3AsO4 %2B HCl %3D ZnCl2 %2B AsH3 %2B H2O
^Unexpected character ('%')Zn %2B H3AsO4 %2B HCl %3D ZnCl2 %2B AsH3 %2B H2O
^Unexpected character ('%')