原子個(gè)數(shù)(或下標(biāo)數(shù)字) $\frac{該元素的A_r\times原子個(gè)數(shù)}{化合物的M_r}$ $\frac{1\times2}{18}\times100\%\approx11.1\%$ $\frac{16\times1}{18}\times100\%\approx88.9\%$ $18\,\text{g}\times\frac{1\times2}{18}\times100\% = 2\,\text{g}$ $18\,\text{g}\times\frac{16\times1}{18}\times100\% = 16\,\text{g}$ $18\,\text{g}-2\,\text{g}=16\,\text{g}$
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