The number of moles of $Mg_3(PO_4)_2$ containing $0.25$ moles of oxygen atoms is:

  • A
    $2.55 \times 10^{-2}$
  • B
    $3.125 \times 10^{-2}$
  • C
    $3.125 \times 10^{-3}$
  • D
    $0.255$

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