Aluminum sulfide, additionally called dialuminium trisulfide, is one ionic link of aluminum and sulfur stood for by the chemistry formula Al2S3 <1, 2>. It exists in various crystalline forms and also hydrolyzes to aluminum hydroxide/oxide <3, 4>.

Aluminum Sulfide Identification

CAS Number1302-81-4 <1, 2>
PubChem CID16684788 <6>
ChemSpider ID140154 <1>
EC Number215-109-0 <1, 2>
InChI KeyZPXDOGRYMSWBBM-UHFFFAOYSA-N <6>



You are watching: Chemical formula for aluminum and sulfur

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Aluminum Sulfide Formula


How is Aluminum Sulfide Prepared

Its synthetic through direct heating the aluminum and sulfur can be represented by the complying with equation <7>:

2Al + 3S → Al2S3


However, the reaction is extremely exothermic, and it is not desirable to warmth the whole mixture <7>. Also, sulfur is a volatile reactant the melts away prior to the reaction takes ar <7>. Therefore, lead sulfide is frequently used because that the preparation of Al2S3 <7>:

2Al + 3PbS → Al2S3 + 3Pb


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Aluminum Sulfide


Reactions with various other Compounds

Aluminum Sulfide and Water

When aluminum sulfide is exposed to moisture in the atmosphere, it undergoes hydrolysis reaction to form aluminum hydroxide and hydrogen sulfide <5>.

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

Aluminum Sulfide and Hydrochloric Acid

Aluminum sulfide top top reacting through hydrochloric acid develops hydrogen sulfide and aluminum chloride, together shown listed below <8>:

Al2S3 + 6HCl → 2AlCl3 + 3H2S


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Aluminum Sulfide Lewis Structure


Properties and also Characteristics that Aluminum Sulfide

General Properties

Molar Mass/Molecular Weight150.158 g/mol <1>

Physical Properties

Color and also AppearanceGray powder or granules <2>
Melting Point1,100 °C, 2,012 °F <2>
Boiling Point1,500 °C, 2,732 °F <2>
Density2.32 g cm-3 <2>
State of issue at room temperature (solid/liquid/gas)Solid <2>
SolubilityInsoluble in (CH3)2CO (acetone) <9>
Solubility in WaterReacts and decomposes in H2O <9>
Heat volume (C) 105.1 J/mol K
Standard Molar Enthalpy-724 kJ/mol <9>
Standard Molar Entropy116.9 J/mol K

Atomic Properties

Crystal StructureTrigonal, tetragonal, hexagonal <3, 4>

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Aluminum Sulfide crystal Structure


What is It supplied for

Producing necessary compounds prefer ethanethiol and chemicals compelled for tanning and also making file <10>Preparing hydrogen sulfide that has actually several commercial uses <11>

Is Aluminum Sulfide Toxic

Exposure to aluminum sulfide can cause skin and severe eye wake up <12>. Inhalation the dust, vapor, or fumes deserve to cause difficulty in breath <12>.

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