Weight of Magnesium phosphate that contains 4 moles of oxygen atoms in it is

Formula of Magnesium phosphate is Mg3PO42.Every 1 mole of Mg3(PO4)2contains 8 moles of Oxygen atoms.In 12 mole of Mg3(PO4)2, there will be 4 moles of Oxygen atoms.Mass of 12 mole of Magnesium phosphate=GMW (262 g)2=131 g ;