Error:
Cu2As2O7 %2B Zn %2B H2SO4 %3D Cu %2B AsH3 %2B ZnSO4 %2B H2O
^Unexpected character ('%')Cu2As2O7 %2B Zn %2B H2SO4 %3D Cu %2B AsH3 %2B ZnSO4 %2B H2O
^Unexpected character ('%')