Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.

Masspercentofcalcium=3×(atomicmassofcalcium)molecularmassofCa3(PO4)2×100
=120u310u×100=38.71%
Masspercentofphosphorus=2×(atomicmassofphosphorus)molecularmassofCa3(PO4)2×100
=2×31u310u×100=20%
Masspercentofoxygen=8×(atomicmassofoxygen)molecularmassofCa3(PO4)2×100
=8×16u310u×41.29%