Q27Short answer
Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.
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Mass percent of calcium = × 100 molecular mass of Ca 3 (PO4 )2 120 u = ×100 = 38.71% 310 u 2 × (atomic mass of phosphorus) Mass percent of phosphorus = × 100 molecular mass of Ca 3 (PO 4 )2 2 × 31 u = ×100 = 20% 310 u 9 Some Basic Concepts of Chemistry 8 × ( Atomic mass of oxygen) Mass percent of oxygen = molecular mass of Ca (PO ) × 100 3 4 2 8 × 16 u = ×100 = 41.29% 310 u