Mr ( Fe2O3) = 2Ar(Fe) + 3Ar(O) = 2 * 56 + 3*48 = 160
Mr (BaSO4) = Ar(Ba)+ Ar(S) + 4Ar(O) = 137+32+64 = 233
Mr ( Fe2O3) = 2Ar(Fe) + 3Ar(O) = 2 * 56 + 3*48 = 160
Mr (BaSO4) = Ar(Ba)+ Ar(S) + 4Ar(O) = 137+32+64 = 233