Hello,
Below are some few steps to get ur ans.
1 mole of Mg3 (PO4)2 (molecule) contains 3 moles of Mg atoms, 2 miles of P atoms and 2 X 4 moles of 0 atoms.
1 mole Mg3(PO4)2 contains 8 moles of oxygyen atoms
Thus, x mole will contain -0.25 moles
x=(0.25X 1)/8
=0.03125 moles(Ans)
I hope this helps u.
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