Fehler:
Zn %2B Hg%28NO3%292 %3D Hg %2B Zn%28NO3%292
^Unerwartets Zeichen ('%')Zn %2B Hg%28NO3%292 %3D Hg %2B Zn%28NO3%292
^Unerwartets Zeichen ('%')