例1 2005年春,我国查处了数起“苏丹红”染色剂充当食品添加剂的案件.“苏丹红”本是系列工业原料,其中的“苏丹一号”(化学式为C16H12N2O)因能使食品变得鲜红美丽而被不法分子利用.1个“苏丹一号”分子中共含__个原子,该物质中所含质量分数最大的元素是__. (2005年山东滨州中考试题) 解析:虽然同学们对“苏丹红”和“苏丹一号”非常陌生,但对化学式和物质微观构成则是熟悉的。所以,根据分子的结构知识和化合物中某元素质量分数的计算 Example 1 In the spring of 2005, China investigated several cases of “Sudan Red” dye as a food additive. “Sudan Red” is a series of industrial raw materials, of which “Sudan One” (formula C16H12N2O) can make foods The red is beautiful and is used by lawless elements. One “Sudan-1” molecule contains __ atoms, and the substance with the largest mass fraction is __. (2005 Binzhou middle school test question) Analysis: Although the students It is unfamiliar with “Sudan Red” and “Sudan One,” but is familiar with chemical formulas and the microcosmic composition of matter. Therefore, according to the structure of the molecule and the calculation of the mass fraction of an element in the compound