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有关式量计算的几个问题天津市第三中学（３００１３１）童文中１某式样（ＮＨ４）２ＳＯ４和（ＮＨ４）２ＨＰＯ４的混合物含氮为２１．２％，则混合物中含氧约为Ａ．４２．４％Ｂ４８．５％．Ｃ８１％Ｄ．３５．６％解：这两种化合物中氮和氧的百分含量分别相同，２１．...
Several problems related to formula calculation Tianjin Third Middle School (300131) Tong Wenzhong 1 The mixture of (NH4)2SO4 and (NH4)2HPO4 has a nitrogen content of 21.2%, and the oxygen content of the mixture is about A. 42.4%B48.5%. C81%D. 35.6% solution: The percentages of nitrogen and oxygen in these two compounds are the same, respectively. ...