71. P2O5 + 3Ca(OH)2 → Ca3(PO4)2 + 3H2O

72. SO3 + 2NaOH → Na2SO4 + H2O

73. 2AlCl3 + 3Ca(OH)2 → 3CaCl2 + 2Al(OH)3

74. AlCl3 + 3NaOH → 3NaCl + Al(OH)3

75. 2Al(OH)3 → Al2O3 + 3H2O

76. 2Fe(OH)3 → Fe2O3 + 3H2O

77. Fe2O3 + 3H2 → 2Fe + 3H2O

78. Fe3O4 + 4H2 → 3Fe + 4H2O

79. Fe2O3 + 3CO → 2Fe + 3CO2

80. Fe3O4 + 4CO → 3Fe + 4CO2

Em tham khảo!

$\text{71) P2O5+3Ca(OH)2$\rightarrow$Ca3(PO4)2+3H2O}$

Tỉ lệ: $\text{1:3:1:3}$

$\text{72) SO3+2NaOH$\rightarrow$Na2SO4+H2O}$

Tỉ lệ: $\text{1:2:1:1}$

$\text{73) 2AlCl3+3Ca(OH)2$\rightarrow$3CaCl2+2Al(OH)3}$

Tỉ lệ: $\text{2:3:3:2}$

$\text{74) AlCl3+3NaOH$\rightarrow$3NaCl+Al(OH)3}$

Tỉ lệ: $\text{1:3:3:1}$

$\text{75) 2Al(OH)3$\xrightarrow{t^o}$Al2O3+3H2O}$

Tỉ lệ: $\text{2:1:3}$

$\text{76) 2Fe(OH)3$\xrightarrow{t^o}$Fe2O3+3H2O}$

Tỉ lệ: $\text{2:1:3}$

$\text{77) Fe2O3+3H2$\xrightarrow{t^o}$2Fe+3H2O}$

Tỉ lệ: $\text{1:3:2:3}$

$\text{78) Fe3O4+4H2$\xrightarrow{t^o}$3Fe+4H2O}$

Tỉ lệ: $\text{1:4:3:4}$

$\text{79) Fe2O3+3CO$\xrightarrow{t^o}$2Fe+3CO2}$

Tỉ lệ: $\text{1:3:2:3}$

$\text{80) Fe3O4+4CO$\xrightarrow{t^o}$3Fe+4CO2}$

Tỉ lệ: $\text{1:4:3:4}$