Осуществите превращение: HgO -> O2 -> Al2O3. P -> P2O3 <- O2
2HgO = 2Hg + O₂ O₂ + 2Ba = 2BaO BaO + H₂o = Ba(OH)₂ Ba(OH)₂ + 2HCl = BaCl₂ + 2H₂O 2H₂O = O₂+ 2H₂ 3O₂ + 4Al = 2Al₂O₃