まず、La2Ce3Pr4Nd3Pm5Sm7Eu4Gd4Tb9Dy4Ho9Er4Tm9Yb3Lu7Ac3Th4U4Np5 内の各原子の数を計算します。
La: 2, Ce: 3, Pr: 4, Nd: 3, Pm: 5, Sm: 7, Eu: 4, Gd: 4, Tb: 9, Dy: 4, Ho: 9, Er: 4, Tm: 9, Yb: 3, Lu: 7, Ac: 3, Th: 4, U: 4, Np: 5
次に、周期表の各元素の原子量を調べます。
La: 138.90547, Ce: 140.116, Pr: 140.90765, Nd: 144.242, Pm: 144.912749, Sm: 150.36, Eu: 151.964, Gd: 157.25, Tb: 158.92535, Dy: 162.5, Ho: 164.93032, Er: 167.259, Tm: 168.93421, Yb: 173.054, Lu: 174.9668, Ac: 227.0277521, Th: 232.03806, U: 238.02891, Np: 236.04657
次に、原子数と原子量の積の合計を計算します。
モル質量 (La2Ce3Pr4Nd3Pm5Sm7Eu4Gd4Tb9Dy4Ho9Er4Tm9Yb3Lu7Ac3Th4U4Np5) = ∑ Counti * Weighti =
Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Sm) * Weight(Sm) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Tb) * Weight(Tb) + Count(Dy) * Weight(Dy) + Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(Lu) * Weight(Lu) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(U) * Weight(U) + Count(Np) * Weight(Np) =
2 * 138.90547 + 3 * 140.116 + 4 * 140.90765 + 3 * 144.242 + 5 * 144.912749 + 7 * 150.36 + 4 * 151.964 + 4 * 157.25 + 9 * 158.92535 + 4 * 162.5 + 9 * 164.93032 + 4 * 167.259 + 9 * 168.93421 + 3 * 173.054 + 7 * 174.9668 + 3 * 227.0277521 + 4 * 232.03806 + 4 * 238.02891 + 5 * 236.04657 =
15948.1138 g/mol
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