Mr - молекулярная массаW - массовая доля атомаAr - атомная массаn - число атомовW = n * Ar/MrCH3COOH:Mr(CH3COOH) = (12 * 2) + (1 * 4) + (16 * 2) = 24 + 4 +32 = 60(г/моль)W(C) = (12 * 2) / 60 =0,4 * 100 = 40%W(H) = (1 * 4) / 60 = 0,06 * 100 = 6%W(O) = (16 * 2) / 60 = 0,54 * 100 = 54%AgNO3:Mr(AgNO3) = 108 + 14 + (16 * 3) = 170W(Ag) = 108 / 170 = 0,64 * 100 = 64%W(N) = 14 / 170 = 0,08 * 100 = 8%W(O) = 16 * 3 / 170 = 0,28 * 100 = 28%Na2SiO3:Mr(Na2SiO3) = (23 * 2) + 28 + (16 * 3) = 46 + 28 + 48 = 122W(Na) = (23 * 2) / 122 = 0,38 * 100 = 38%W(Si) = 28 / 122 = 0,23 * 100 = 23%W(O) = (16 * 3) / 122 = 0,39 * 100 = 39%BaCO3:Mr(BaCO3) = 137 + 12 + (16 * 3) = 197W(Ba) = 137 / 197 =0,7 * 100 = 70%W(C) = 12 / 197 = 0,06 * 100 = 6%W(O) = (16 * 3) / 197 =0,24 * 100 = 24%Fe2(SO4)3:Mr(Fe2(SO4)3) = (56 * 2) + (32 * 3) + (16 * 12) =400W(Fe) = (56 * 2) / 400 =0,28 * 100 = 28%W(S) = (32 * 3) / 400 = 0,24 * 100 = 24%W(O) = (16 * 12) / 400 = 0,48 * 100 = 48%