Fehler:
H2O %2B Fe %2B NaNO3 %3D NaOH %2B NH3 %2B Fe%28OH%293
^Unerwartets Zeichen ('%')H2O %2B Fe %2B NaNO3 %3D NaOH %2B NH3 %2B Fe%28OH%293
^Unerwartets Zeichen ('%')