81.875 g of magnesium phosphate Mg₂(PO₄)₃
Explanation:
The chemical formula of magnesium phosphate is Mg₃(PO₄)₂.
molar mass of Mg₃(PO₄)₂ = atomic weight of Mg × 3 + atomic weight of P × 3 + atomic weight of O × 3 × 4
molar mass of Mg₃(PO₄)₂ = 24 × 3 + 31 × 2 + 16 × 2 × 4 = 262 g/mole
Knowing the molar mass of Mg₃(PO₄)₂, we devise the following reasoning:
if in 262 g of Mg₂(PO₄)₃ there are 48 g of Mg
then in X g of Mg₂(PO₄)₃ there are 15 g of Mg
X = (262 × 15) / 48 = 81.875 g of Mg₂(PO₄)₃
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