ABERAZIONGO ABERAZIONGO Chemistry Answered Balance the chemical equations in Questions 17-20. 17. MgO + HBr →→→→ MgBr₂. 18. N₂ + O₂ N₂O5 MgBr₂ + H₂0 19. C₂H4 + O2 CO₂ + H₂O 20. Fe + HCl → FeCl₂ + H₂ Skill