Fehler:
H2O2 %2B H%3A%2B %2B Cr2O7%3A2- %3D H2O %2B H3CrO8
^Unerwartets Zeichen ('%')H2O2 %2B H%3A%2B %2B Cr2O7%3A2- %3D H2O %2B H3CrO8
^Unerwartets Zeichen ('%')