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Aluminium sulfide is readily prepared by ignition of the elements [6] 2 Al + 3 S → Al 2 S 3. This reaction is extremely exothermic and it is not necessary or desirable to heat the whole mass of the sulfur-aluminium mixture; (except possibly for very small amounts of reactants).
13 Al aluminium; use: 2.70 g/cm 3: WEL (near r.t.) ... 16 S sulfur (orthorhombic, alpha) use: ... formula weight = 222 Notes
Aluminium sulfate is a salt with the formula Al 2 ... The mass is now systematically ... The compound decomposes to γ-alumina and sulfur trioxide when heated between ...
Aluminium: Silicon: Phosphorus: Sulfur: ... the chemical formula S 8. Elemental sulfur is a ... by mass in the Earth. Elemental sulfur can be found near ...
The molecular mass (for molecular compounds) and formula mass (for non-molecular compounds, such as ionic salts) are commonly used as synonyms of molar mass, differing only in units (daltons vs g/mol); however, the most authoritative sources define it differently. The difference is that molecular mass is the mass of one specific particle or ...
As aluminium is a small atom relative to these chalcogens, these have four-coordinate tetrahedral aluminium with various polymorphs having structures related to wurtzite, with two-thirds of the possible metal sites occupied either in an orderly (α) or random (β) fashion; the sulfide also has a γ form related to γ-alumina, and an unusual ...
Aluminium: Silicon: Phosphorus: Sulfur: ... More thoroughly investigated are compounds of the formula R 4 Al 2 ... the Earth's mantle is only 2.38% aluminium by mass. ...
Reaction with an excess of the chalcogen can similarly result in lower chalcogenides, with chalcogen ions containing chains of the chalcogen atoms in question. For example, sodium can react with sulfur to form the sulfide (Na 2 S) and various polysulfides with the formula Na 2 S x (x from 2 to 6), containing the S 2− x ions. [65]