Aluminium and sulphur make aluminum sulfidebalanced equation: 16Al + 3S8 -> 8Al2S3
Al2S3
There is one type of metal in Al2S3 and that is Al (aluminum). If you want to know how many metal atoms are in 1 molecule of Al2S3, then the answer would be 2, because there are 2 Al atoms.
4 Al + 3O2 = 2Al2O3
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Since aluminum cations are trivalent and sulfide anions are divalent, the formula is Al2S3, so that the charges balance.
Al2S3
2 al^3+ 3s^2-
The oxidation number of Al is +III and S is -II.
Al and S combine to form aluminum sulfide, Al2S3
4Al + 3O2 --------> 2Al2O3
Balance Cu2(SO4) plus Al yields Al2(SO4)3 plus Cu