UPSEE Solved Model Paper 2

In Mg3(PO4)2 one molecule of it contains 8 atoms of oxygen
Since 8 moles of oxygen atoms are present in 1 mole Mg3(PO4)2.
∴ 0.25 mole of oxygen atoms are present in

0.25

8

= 3.125×10−2 moles of Mg3(PO4)2.