Calculation:
Molecular mass of Ca3(PO4) = (3 X 40) + (2 X 31) + (8 X 16)
Molecular mass of Ca3(PO4) = 310
Mass percentage of Ca = \[\frac{3\times 40}{310\times 100}\]
Mass percentage of Ca = 38.71%
Mass percentage of P = \[\frac{2\times 31}{310\times 100}\]
Mass percentage of P = 20%
Mass percentage of O = \[\frac{8\times 16}{310}\]
Mass percentage of O = 41.29%