How many moles of magnesium phosphate, \( \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2} \) wil...

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How many moles of magnesium phosphate, \( \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2} \) will contain \( 0.25 \) mole of oxygen atoms?
(1) \( 3.125 \quad 10^{-2} \)
(2) \( 1.25 \quad 10^{-2} \)
(3) \( 2.510^{-2} \)
(4) \( 0.02 \)
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