Find the relative formula mass of $C a S O_{4}$ ?

146

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156

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136

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166

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Solution

The correct option is C $136$
The relative atomic mass of $C a = 40$
The relative atomic mass of $S = 32$
The relative atomic mass of $O = 16$
So, the relative molecular mass of $C a S O_{4} = 40 + 32 + 16 \times 4 = 136$

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