Mr(Ca3(PO4)2) = 40 + 31*2 + 16*8 = 310
W(P) = Ar(P) * n / Mr(Ca3(PO4)2) *100% = 31*2 / 310 *100% = 20%
Mr(Ca3(PO4)2) = 40 + 31*2 + 16*8 = 310
W(P) = Ar(P) * n / Mr(Ca3(PO4)2) *100% = 31*2 / 310 *100% = 20%