1. <span>3Na₂SO₄ + Na₂S + 8СО = 4Na₂CO₃ + 4СO₂ + 4S</span>
S +O₂=SO₂
2SO₂ +3 O₂= 2SO₃
SO₃ + H₂O=H₂SO₄
2. 3H₂SO₄ +2AI(OH)₃=AI₂(SO₄)₃ + 6H₂O
3. <span>Al₂(SO4)₃ + 6NaOH = 2Al(OH)₃↓ + 3Na₂SO₄
4. </span><span>2Al(OH)₃=AI₂O₃+3H₂O</span>
8Al + 30HNO3 → 8Al(NO3)3 + 3N2O + 15H2O
8+30+8+3+15=64
<span>S + KMnO4 -> K2SO4 + MnO2
S(0) -6e=S(+6) 6 1
Mn(+7) +3e = Mn(+4) 3 2
</span>S + 2KMnO4 -> K2SO4 + 2MnO2