Fehler:
HCl %2B KCr2O7 %3D H2O %2B Cl2 %2B KCl %2B CrCl3
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Unerwartets Zeichen ('%')HCl %2B KCr2O7 %3D H2O %2B Cl2 %2B KCl %2B CrCl3
^
Unerwartets Zeichen ('%')