Question

Writ the chemical formula and also calculate molecular mass (formula unit mass) a)potassium sulphide b)magnesium sulphide c)aluminum sulphide

Answer 1

So, I would be listing the chemical formulae and molecular masses of the following compounds :
1. Potassium Sulphide.
Chemical Formula : K2S
Molecular Mass : 23 × 2 + 32
= 46 + 32 = 78.

2. Magnesium Sulphide.
Chemical Formula : MgS
Molecular Mass : 24 + 32
= 56.

3. Calcium Sulphide.
Chemical Formula : CaS
Molecular Mass : 40 + 32
= 72

NOTE : The molecular weights have not been taken pointwise they have simply been rounded off.

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