Fehler:
HNO3 %2B ZnS %3D Zn%28NO3%292 %2B S %2B NO %2B H2O
^
Unerwartets Zeichen ('%')HNO3 %2B ZnS %3D Zn%28NO3%292 %2B S %2B NO %2B H2O
^
Unerwartets Zeichen ('%')