Chyba:
K2Cr2O7 %2B H2S %2B H2SO4 %3D K2SO4 %2B Cr2%28SO4%293 %2B S %2B H2O
^
Neočakávaný ('%')K2Cr2O7 %2B H2S %2B H2SO4 %3D K2SO4 %2B Cr2%28SO4%293 %2B S %2B H2O
^
Neočakávaný ('%')