(1) 4N + 5$O_{2}$ $\xrightarrow{t°}$ 2$N_{2}O_{5}$

(2) 3Fe + 2$O_{2}$ $\xrightarrow{t°}$ $Fe_{3}O_{4}$

(3) $P_{2}O_{5}$ + 3$H_{2}O$ → 2$H_{3}PO_{4}$

(4) 2$Al(OH)_{3}$ $\xrightarrow{t°}$ $Al_{2}O_{3}$ + 3$H_{2}O$

(5) 2Mg + $O_{2}$ $\xrightarrow{t°}$ 2MgO

(6) 4CO + $Fe_{3}O_{4}$ $\xrightarrow{t°}$ 4$CO_{2}$ + 3Fe

(7) 3$Fe_{3}O_{4}$ + 8Al $\xrightarrow{t°}$ 4$Al_{2}O_{3}$ + 9Fe

(8) 3Mg + $Fe_{2}O_{3}$ $\xrightarrow{t°}$ 3MgO + 2Fe

(9) 2Al + 3$Br_{2}$ $\xrightarrow{t°}$ 2$AlBr_{3}$

(10) 4Cr + 3$O_{2}$ $\xrightarrow{t°}$ 2$Cr_{2}O_{3}$

(11) 2Al + 3S $\xrightarrow{t°}$ $Al_{2}S_{3}$

(12) 6Na + 2$H_{3}PO_{4}$ → 2$Na_{3}PO_{4}$ + 3$H_{2}$ 

(13) 4$Fe(OH)_{2}$ + $O_{2}$ $\xrightarrow{t°}$ 2$Fe_{2}O_{3}$ + 4$H_{2}O$

(14)  2$Fe(OH)_{3}$ + 3$H_{2}SO_{4}$ → $Fe_{2}(SO_{4})_{3}$ + 6$H_{2}O$

(15) 2$K_{3}PO_{4}$ + 3$Ba(OH)_{2}$ → 6KOH + $Ba_{3}(PO_{4})_{2}$

(16) $Al_{4}C_{3}$ + 12$H_{2}O$ → 4$Al(OH)_{3}$ + 3$CH_{4}$

(17) 2$C_{2}H_{6}$ + 7$O_{2}$ $\xrightarrow{t°}$ 4$CO_{2}$ + 6$H_{2}O$

(18) 2Al + 3$FeSO_{4}$ → 3Fe + $Al_{2}(SO_{4})_{3}$ 

(19) $Fe_{2}(SO_{4})_{3}$ + 6NaOH → 2$Fe(OH)_{3}$ + 3$Na_{2}SO_{4}$ 

(20) 3$Zn(OH)_{2}$ + 2$H_{3}PO_{4}$ → $Zn_{3}(PO_{4})_{2}$ + 6$H_{2}O$

(21) 3CaO + 2$H_{3}PO_{4}$ → $Ca_{3}(PO_{4})_{2}$ + 3$H_{2}O$

Đáp án:

 

Giải thích các bước giải:

 1)4N+3O2=2N2O3

2)3Fe+2O2=Fe3O4

3)P2O5+3H2O=2H3PO4

4)2Al(OH)3=Al2O3+3H2O

5)2Mg+O2=2MgO

6)4CO+Fe3O4=3Fe+4CO2

7)3Fe3O4+8Al=9Fe+4Al2O3

8)3Mg+Fe2O3=2Fe+3MgO

9)2Al+3Br2=2AlBr3

10)4Cr+3O2+=2Cr2O3

11)2Al+3S=Al2S3

12)6Na+2H3PO4=2Na3PO4+3H2

13)4Fe(OH)2+O2=2Fe2O3+4H2O

14)2Fe(OH)2+3H2SO4=Fe2(SO4)3+6H2O

15)3K3PO4+2Ba(OH)2=KOH+6Ba3(PO4)2

16)12Al4C3+H2O=4Al(OH)3+3CH4

17)2C2H6+7O2=4CO2+6H2O

18)2Al+3FeSO4=Fe+3Al2(SO4)3

19)Fe2(SO4)3+6NaOH=2FE(OH)3+3Na2SO4

20)3Zn(OH)2+2H3PO4=6Zn3(PO4)2+H2O

21)2CaO+3H3PO4=Ca2(PO4)2+3H2O

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