I. Cân bằng phương trình 1. Na + O2 ---> Na2O 2. K + O2 ---> K2O 3. Ca + O2 ---> CaO 4. Cu + O2 ---> CuO 5. Mg + O2 ---> MgO 6. Pb + O2 ---> PbO 7. Ba + O2 ---> BaO 8. Al + O2 ---> Al2O3 9. Fe + O2 ---> Fe3O4 10. Al(OH)3 ---> Al2O3 + H2O 11. Fe(OH)3 ---> Fe2O3 + H2O 12. Na2O + H2O --> NaOH 13. K2O + H2O --> KOH 14. CaO + H2O ---> Ca(OH)2 15. P + O2 ---> P2O5 16. S + O2 ---> SO2 17. P2O5 + H2O ---> H3PO4

2 câu trả lời

Đáp án+Giải thích các bước giải:

1. `4Na + O_2 → 2Na_2O`
2. `4K + O_2 → 2K_2O`
3. `2Ca + O_2 → 2CaO`
4. `2Cu + O_2 → 2CuO`
5. `2Mg + O_2 → 2MgO`
6. `2Pb + O_2 → 2PbO`
7. `2Ba + O_2 → 2BaO`
8. 4Al + 3O2 → 2Al2O3
9. 3Fe + 2O2 → Fe3O4
10. 2Al(OH)3 → Al2O3 + 3H2O
11. 2Fe(OH)3→ Fe2O3 + 3H2O
12. Na2O + H2O → 2NaOH    
13. K2O + H2O → 2KOH    
14. CaO + H2O  → Ca(OH)2
15. 4P + 5O2 → 2P2O5  
16. S + O2 → SO2
17. P2O5 + 3H2O → 2H3PO4

1. 4Na  +  O2    $\longrightarrow$     2Na2O
2.  4K  +  O2      $\longrightarrow$    2K2O
3.  2Ca  +  O2    $\longrightarrow$     2CaO
4.  2Cu  +  O2    $\longrightarrow$     2CuO
5.  2Mg  +  O2    $\longrightarrow$    2MgO
6.  2Pb  +  O2      $\longrightarrow$   2PbO
7. 2Ba  +  O2    $\longrightarrow$     2BaO
8. 4Al    +  3O2        $\longrightarrow$     2Al2O3
9. 3Fe   +  2O2          $\longrightarrow$     Fe3O4
10. 2Al(OH)3    $\longrightarrow$     Al2O3  +   3H2O
11. 2Fe(OH)3    $\longrightarrow$    Fe2O3  +   3H2O
12. Na2O    +    H2O$\longrightarrow$   2NaOH    
13. K2O    +    H2O $\longrightarrow$      2KOH    
14. CaO    +   H2O  $\longrightarrow$  Ca(OH)2 >> Phương trình đã cân bằng
15. 4P     +   5O2        $\longrightarrow$    2P2O5  
16. S  +     O2        $\longrightarrow$       SO2 >> Phương trình đã cân bằng
17. P2O5     +   3H2O $\longrightarrow$   2H3PO4

@Hạ

#học tốt, có sai sót mong giúp đỡ

 

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