Fehler:
H2SO4 %2B H2S %2B KMn4 %3D H2O %2B K2SO4 %2B S %2B MnSO4
^Unerwartets Zeichen ('%')H2SO4 %2B H2S %2B KMn4 %3D H2O %2B K2SO4 %2B S %2B MnSO4
^Unerwartets Zeichen ('%')