How many moles of magnesium phosphate,$Mg_{3}(PO_{4})_{2}$ will contain $0.25 \ mol$ of oxygen atoms?
- A$1.25 \times 10^{-2}$
- B$2.5 \times 10^{-2}$
- C$0.02$
- D$3.125 \times 10^{-2}$
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