Hoàn thành PTHH: a) Al --> AlCl3 --> Al(OH)3 --> Al2O3 --> Al b) NaCl --> NaOH --> Na2CO3 --> Na2SO4 --> NaCl --> Cl2 --> AlCl3 --> Al(OH)3 --> Al2O3 --> Al --> NaAlO2 c) FeS2 --> SO2 --> SO3 --> H2SO4 --> CuSO4 --> Na2SO4 --> NaOH --> Na2ZnO2 d) Mg --> MgSO4 --> Mg(OH)2 --> MgO --> MgCl2 --> Mg(NO3)2 --> MgCO3 --> MgO

a. $Al \to AlC{l_3} \to Al{\left( {OH} \right)_3} \to A{l_2}{O_3} \to Al$

$2Al+3Cl_2 → 2AlCl_3$

$AlCl_3+3NaOH → Al(OH)_3+3NaCl$

$2Al(OH)_3 → Al_2O_3+3H_2O$

$2A{l_2}{O_3}\xrightarrow{{dpnc}}4Al + 3{O_2}$

b. $NaCl \to NaOH \to N{a_2}C{O_3} \to N{a_2}S{O_4} \to NaCl \to C{l_2} \to AlC{l_3} \to Al{\left( {OH} \right)_3} \to A{l_2}{O_3} \to Al \to NaAl{O_2}$

$2NaCl + 2{H_2}O\xrightarrow[{cmn}]{{dp{\text{dd}}}}2NaOH + C{l_2} + 2{H_2}$

$2NaOH+CO_2 → Na_2CO_3+H_2O$

$Na_2CO_3+H_2SO_4 → Na_2SO_4+H_2O+CO_2$

$Na_2SO_4+BaCl_2 → BaSO_4+2NaCl$

$2NaCl\xrightarrow{{dpnc}}2Na + C{l_2}$

$3Cl_2+2Al → 2AlCl_3$

$AlCl_3+3NaOH → Al(OH)_3+3NaCl$

$2Al{\left( {OH} \right)_3}\xrightarrow{{{t^0}}}A{l_2}{O_3} + 3{H_2}O$

$2A{l_2}{O_3}\xrightarrow{{dpnc}}4Al + 3{O_2}$

$2Al+2NaOH+2H_2O → 2NaAlO_2+3H_2$

c. $Fe{S_2} \to S{O_2} \to S{O_3} \to {H_2}S{O_4} \to CuS{O_4} \to N{a_2}S{O_4} \to NaOH \to N{a_2}Zn{O_2}$

$4FeS_2+11O_2 → 2Fe_2O_3+8SO_2$

$2SO_2+O_2 → 2SO_3$

$SO_3+H_2O → H_2SO_4$

$H_2SO_4+Cu(OH)_2 → CuSO_4+2H_2O$

$CuSO_4+2NaOH → Cu(OH)_2+Na_2SO_4$

$Na_2SO_4+Ba(OH)_2 → 2NaOH+BaSO_4$

$2NaOH+Zn → Na_2ZnO_2+H_2$

d. $Mg \to MgS{O_4} \to Mg{\left( {OH} \right)_2} \to MgO{\text{ }} \to MgC{l_2} \to Mg{\left( {N{O_3}} \right)_2} \to MgC{O_3} \to MgO$

$Mg+H_2SO_4 → MgSO_4+H_2$

$MgSO_4+Ba(OH)_2 → Mg(OH)_2+BaSO_4$

$Mg(OH)_2 → MgO+H_2O$

$MgO+2HCl → MgCl_2+H_2O$

$MgCl_2+2AgNO_3 → Mg(NO_3)_2+2AgCl$

$Mg(NO_3)_2+Na_2CO_3 → 2NaNO_3+MgCO_3$

$MgC{O_3}\xrightarrow{{{t^o}}}MgO + C{O_2}$

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