Fehler:
H2S %2B HBr2O3 %3D H2O %2B H2SO4 %2B Br2
^
Unerwartets Zeichen ('%')H2S %2B HBr2O3 %3D H2O %2B H2SO4 %2B Br2
^
Unerwartets Zeichen ('%')