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Question
The formula unit masses of CaS and MgS are _____ and _____ respectively.
[Atomic masses of Ca, Mg and S are 40 u, 24 u and 32 u respectively.]
[Atomic masses of Ca, Mg and S are 40 u, 24 u and 32 u respectively.]
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Solution
The formula unit mass of \({Ca}{S}\)
\(= (1 \times \text{atomic mass of Ca})\) + \((1 \times \text{atomic mass of S})\)
\(=(1 \times 40 ~u) + (1 \times 32 ~u) \)
\(= 72~u\)
The formula unit mass of \({Mg}{S}\)
\(= (1 \times \text{atomic mass of Mg})\) + \((1 \times \text{atomic mass of S})\)
\(=(1 \times 24 ~u) + (1 \times 32 ~u) \)
\(= 56~u\)
\(= (1 \times \text{atomic mass of Ca})\) + \((1 \times \text{atomic mass of S})\)
\(=(1 \times 40 ~u) + (1 \times 32 ~u) \)
\(= 72~u\)
The formula unit mass of \({Mg}{S}\)
\(= (1 \times \text{atomic mass of Mg})\) + \((1 \times \text{atomic mass of S})\)
\(=(1 \times 24 ~u) + (1 \times 32 ~u) \)
\(= 56~u\)
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