How many moles of magnesium phosphate Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?

Question

How many moles of magnesium phosphate Mg₃(PO₄)₂ will contain 0.25 mole of oxygen atoms?

1.25 $\times$ 10^-2

2.5 $\times$ 10^-2

0.02

3.125 $\times$ 10^-2

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