Объяснение:
1. 2CO + O₂ = 2CO₂
2. 2Al + 6HCl = 2AlCl3 + 3H2
3. 2FeCl₂ + Cl₂ = 2FeCl₃
4. Fe₂O₃ + 3H₂ = 2Fe + 3H₂O
5. Ca(OH)₂ + 2HCl = CaCl₂ + 2H₂O
6. 2Al + 3Br₂ = 2AlBr₃
7. 4P + 5O₂ = 2P₂O₅
8. 2Cu + O₂ = 2CuO
9. 2HgO = 2Hg + O₂
10. 2Fe(OH)₃ = Fe₂O₃ + 3H₂O
11. 3Fe + 2O₂ = Fe₃O₄
12. 2H₂O = 2H₂ + O₂
13. 2KClO₃ = 2KCl + 3O₂
14. 4Al+3O₂ = 2Al₂O₃
15. N₂O₅ + H₂O = 2HNO₃
16. Ca(HCO₃)₂ = CaCO₃ + H₂O + CO₂
17. 2Al + 3H₂SO₄ = Al₂(SO₄)₃ + 3H₂
18. 2Li + 2H₂O = 2LiOH + H₂
19. 6NaClO = 2NaClO₃ + 4NaCl
20. 2NO₂ + H₂O = HNO₃ + HNO₂
21. SiO₂ + 4HF = SiF₄ + 2H₂O
22. Fe₂O₃ + 3H₂SO₄ = Fe₂(SO₄)₃ + 3H₂O
23. FeSO₄ + 2NaOH = Fe(OH)₂ + Na₂SO₄
24. Na₂O₂ + H₂O = 2NaOH + O₂
25. 2KNO₃ = 2KNO₂ + O₂
26. Ca₃(PO₄)₂ + 3H₂SO₄ = 3CaSO₄ + 2H₃PO₄
27. Cu(NO₃)₂ = CuO + 2NO₂ + O₂
28. C₂H₄ + 3O₂ = 2H₂O + 2CO₂
29. 4NH₃ + 5O₂ = 4NO + 6H₂O
30. 2C₂H₆ + 7O₂ = 6H₂O + 4CO₂
31. (NH₄)₂CO₃ = 2NH₃ + H₂O + CO₂
32. 4HNO₃ = 2H₂O + 4NO₂ + O₂
33. 2AgNO₃ = 2Ag + 2NO₂ + O₂
34. 2NH₄NO₃ = 2N₂O + 4H₂O
35. 3Cl₂ + 6KOH = KClO₃ + 5KCl + 3H₂O
36. 4K₂SO₃ = K₂S + 3K₂SO₄
37. H₂S + 4H₂O₂ = H₂SO₄ + 4H₂O
38. C₃H₈ + 5O₂ = 4H₂O + 3CO₂
2HCl+MgO=Mg(NO3)2+H2O
n(Mg(NO3)2)=m/M=32,3/148=0.218 моль
n(HCl)=2n(Mg(NO3)2=2*0,218=0.436 моль
m(HCl)=n*M=0.436*36.5=15.91 г
m(HCl)р-ра=15.91/200 *100%=7,96%
ответ: 7,96%