Error:
CrCl3 %2B Zn %2B HCl %3D CrCl2 %2B ZnCl2 %2B H2
^
Unexpected character ('%')CrCl3 %2B Zn %2B HCl %3D CrCl2 %2B ZnCl2 %2B H2
^
Unexpected character ('%')