<span>FeBr3+Na2S→FeS+S↓+NaBr
</span><span>2Fe(OH)₃+3H₂SO₄-->Fe₂(SO₄)₃+6H₂O
</span><span>N2O5 + H2O = 2HNO3
</span>
<span>BaCl2+ H2SO4 = BaSO4+2HCl</span>
SiO4 => Si^(+4)
...........
S→HgS→SO2→NaSO4→SO2→SO3→H2SO4.
1. S+Hg->HgS;
2. HgS+O2->SO2↑+Hg;
3. SO2+2Na2OH->Na2SO3+H2O;
4. Na2SO3+2HCL->2NaCL+H2O+SO2↑;
5. 2SO2+O2->2SO3;
6. SO3+H2O->H2SO4.
W1-массовая доля H в H2SO3
w2-массовая доля H в H2O
w1(H)=2÷82×100%~2.44%
w2(H)=2÷18×100%~11.1%
w1<w2