Осуществить следующие превращения 1.Al-->AlCl3-->Al(OH)3-->Na3AlO3-->Al2(SO4)3; 2.S-->Has-->SO2-->H2SO4-->Na2SO4-->BaSO4;

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Aluminum (Al) reacts with chlorine (Cl2) to form aluminum chloride (AlCl3).
2 Al + 3 Cl2 → 2 AlCl3

Aluminum chloride (AlCl3) reacts with water (H2O) to form aluminum hydroxide (Al(OH)3).
AlCl3 + 3 H2O → Al(OH)3 + 3 HCl

Aluminum hydroxide (Al(OH)3) reacts with sodium hydroxide (NaOH) to form sodium aluminate (Na3AlO3).
Al(OH)3 + 3 NaOH → Na3AlO3 + 3 H2O

Sodium aluminate (Na3AlO3) reacts with sulfuric acid (H2SO4) to form aluminum sulfate (Al2(SO4)3).
Na3AlO3 + 3 H2SO4 → Al2(SO4)3 + 3 Na2SO4

Sulfur (S) reacts with hydrogen gas (H2) to form hydrogen sulfide gas (H2S).
S + 2 H2 → 2 H2S

Hydrogen sulfide gas (H2S) reacts with oxygen gas (O2) to form sulfur dioxide gas (SO2).
2 H2S + 3 O2 → 2 SO2 + 2 H2O

Sulfur dioxide gas (SO2) reacts with water (H2O) to form sulfuric acid (H2SO4).
SO2 + H2O + 1/2 O2 → H2SO4

Sulfuric acid (H2SO4) reacts with sodium hydroxide (NaOH) to form sodium sulfate (Na2SO4).
H2SO4 + 2 NaOH → Na2SO4 + 2 H2O

Sodium sulfate (Na2SO4) reacts with barium chloride (BaCl2) to form barium sulfate (BaSO4).
Na2SO4 + BaCl2 → BaSO4 + 2 NaCl