W всех элементов в соединениях: HPO3 Ca(NO3)2 Fn3(PO4)2

M(HPO3)=80 W(H)=(100*1)/80=1,25% W(P)=(31*100)/80=38,75% W(O)=(48*100)/80=60% M(Ca(NO3)2)=164 W(Ca)=(40*100)/164=24,4% W(N)=(28*100)/164=17,07% W(O)=(96*100)/164=58,5% M(Fe3(PO4)2)=168+62+128=358 W(Fe)=(168*100)/358=47% W(P)=(62*100)/358=17,3% W(O)=(128*100)/358=35,8%