Verified Answer :

Hagrid

How many moles of oxygen atoms are present in 5
moles of Mg3(PO4)2

All you have to do is to create
a ratio between the molecule and the oxygen atom.

5 moles of Mg3(PO4)2 (4x2 moles
O/1 mole Mg3(PO4)2) = 40 moles of oxygen

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