Find out ratio by mass of calcium sulphide.
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Answer:
Calcium Sulfide
Calcium sulfide has the molecular formula of CaS and the molecular weight of 74.1432 g/mol. It can be prepared by the direct reaction of the elements, calcined in an inert atmosphere, at a 1:1.05 molecular ratio:
Ca + S + heat ⇒ CaS
This white material crystallizes in a cubic structure-like rock salt and the bonding is highly ionic. This is consistent with its description as an ionic solid.
In the crystal, each S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarily, each Ca2+ ion surrounded by six S2− anions. Like many salts containing sulfide ions, CaS typically has an odor of hydrogen sulfide, a foul-smelling gas, which results from a small amount of this gas being formed from hydrolysis of the salt by atmospheric moisture