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What is the name of the ionic compound (NH4)2S according to IUPAC nomenclature rules?
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The IUPAC name is ammonium sulfide.
Reason: the cation NH4+ is named "ammonium" and the anion S2− is "sulfide"; stoichiometry (two ammonium per sulfide) is implied, so the compound is named "ammonium sulfide" (noting that "diammonium sulfide" is sometimes seen but is not the preferred systematic form).
Reason: the cation NH4+ is named "ammonium" and the anion S2− is "sulfide"; stoichiometry (two ammonium per sulfide) is implied, so the compound is named "ammonium sulfide" (noting that "diammonium sulfide" is sometimes seen but is not the preferred systematic form).
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