4) 2HgO = 2Hg + O₂
5) 2H₂O₂ = 2H₂O + O₂
6) Mr(SO₂) = 32+16x2 = 64
ω(S) = 32÷64 = 0.5 ω%(S)=32÷64×100=50%
ω(O) = 32÷64 = 0.5 ω%(O) = 32÷64×100 = 50%
Mr(KClO₃) = 39 + 35.5 + 16x3= 122.5
ω(K) =39÷122.5 = 0.32 ω%(K) =39÷122.5×100 = 32 %
ω(Cl)= 35.5÷122.5 = 0.289 ω%(Cl)= 35.5÷122.5×100 = 28,9%
ω(O) = 48÷122.5 = 0.391 ω%(O) = 48÷122.5×100 = 39,1%