まず、H20He19Li18Be17B16C15N14O13F12Ne11Na10Mg9Al8Si7P6S5Cl4Ar3K2 内の各原子の数を計算します。
H: 20, He: 19, Li: 18, Be: 17, B: 16, C: 15, N: 14, O: 13, F: 12, Ne: 11, Na: 10, Mg: 9, Al: 8, Si: 7, P: 6, S: 5, Cl: 4, Ar: 3, K: 2
次に、周期表の各元素の原子量を調べます。
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983
次に、原子数と原子量の積の合計を計算します。
モル質量 (H20He19Li18Be17B16C15N14O13F12Ne11Na10Mg9Al8Si7P6S5Cl4Ar3K2) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) =
20 * 1.00794 + 19 * 4.002602 + 18 * 6.941 + 17 * 9.012182 + 16 * 10.811 + 15 * 12.0107 + 14 * 14.0067 + 13 * 15.9994 + 12 * 18.9984032 + 11 * 20.1797 + 10 * 22.98976928 + 9 * 24.305 + 8 * 26.9815386 + 7 * 28.0855 + 6 * 30.973762 + 5 * 32.065 + 4 * 35.453 + 3 * 39.948 + 2 * 39.0983 =
3128.6470 g/mol
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