Question

how many moles of magnesium phosphate (Mg3 (po4)2) will contain 0.25 mole of oxygen atoms

Answer 1

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this example help u

8 mole of O2 contains.1 mole of magnesium phosphate (Mg3(PO4)3)

So 0.25 moles of O2  will contains 1/8*0.25 mole of magnesium phosphate (Mg3(PO4)3)

No. of mole of magnesium phosphate (Mg3(PO4)3) in 0.25 moles of O2=3.125*10-2moles