Answer
1) Mg3(PO4)2 is not a molecule but a formala unit. But sometimes for simplicity chemists consider formular unit as a molecule.
There are 6 molecules of Mg3(PO4)2 in 6 Mg3(PO4)2
2) There are 6*3 = 18 atoms of Mg in 6 Mg3(PO4)2
3) There are 6*2*4 = 48 atoms of oxygen in 6 Mg3(PO4)2
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