Fehler:
H2SO4 %2B FeSO4 %2B CrO3 %3D H2O %2B Cr2%28SO4%293 %2B Fe2%28SO4%293
^Unerwartets Zeichen ('%')H2SO4 %2B FeSO4 %2B CrO3 %3D H2O %2B Cr2%28SO4%293 %2B Fe2%28SO4%293
^Unerwartets Zeichen ('%')