How many moles of $Mg_{3}(PO_{4})_{2}$ contain $0.25$ moles of $O$ atoms?
- A$2.55 \times 10^{-2}$
- B$0.0225$
- C$3.125 \times 10^{-2}$
- D$1.5 \times 10^{-2}$
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