Ar(Ba)=137
Ar(S)=32
Ar(O4)=48
Mr(BaSO4)=137+32+48=207
W(Ba)=137:207=0.66х100=66%
W(S)=0.15x100=15%
W(O4)=100%-(66%+15%)=19%
Mr(Ca3(PO4)2= 120+62+96=278
W(Ca3) = 120:278 = 0.43x100 = 43%
W((P)2) = 62:278 = 0.22x100 = 22%
W((O4)2) = 100%-65%=35%
Ar(Ba)=137
Ar(S)=32
Ar(O4)=48
Mr(BaSO4)=137+32+48=207
W(Ba)=137:207=0.66х100=66%
W(S)=0.15x100=15%
W(O4)=100%-(66%+15%)=19%
Mr(Ca3(PO4)2= 120+62+96=278
W(Ca3) = 120:278 = 0.43x100 = 43%
W((P)2) = 62:278 = 0.22x100 = 22%
W((O4)2) = 100%-65%=35%