P<span>2</span>O<span>3</span> + 3H<span>2</span>O ----> 2H<span>3</span>PO<span>3</span>
<span>
+1-1 +4 -2 +1 -2 +4-2 +3-2 +3-1 +2-2 +1 -2 +3-2 +5=2 +2 -1
AgCl; CO2; Cu2S; NO2; Al2O3; FeCl3; NO; Ag2s; Cr2O3; P2O5; CaBr2;
+3- 2 +1-2 +3-2 +2-2 -3+1 +6-2 +1-2 +7-2 +2-2
Mn2O3; Na2O; N2O3; CO; NH3;CrO3; K2O; Mn2O7; N2O;</span>
4Al +3 O2 = 2Al2O3 при температуре 700
2Na + O2 = Na2O2
2H2S + O2 = 2H2O + 2S неполное сгорание
2H2S + 3O2 = 2H2O + 2SO2 полное сгорание, температура = 250 -300