化学式在初中化学中占有非常重要的地位,近几年中考也常出现,解答此类题目可采用分析加计算的方法,下面简单介绍几种题型及其解法。一、利用相对原子质量,相对分子质量来确定物质的化学式例1已知元素R的氧化物的相对分子质量为232,R的相对原子质量为56,则此氧化物的化学式为() The chemical formula occupies a very important position in the chemistry of junior high school. In recent years, the middle school entrance examination has also appeared frequently. To solve this type of problem, analysis and calculation methods can be used. The following briefly introduces several types of questions and their solutions. First, the use of relative atomic mass, relative molecular mass to determine the chemical formula of the substance. Example 1 The oxide R of the known element R has a relative molecular mass of 232 and the relative atomic mass of R is 56. The chemical formula of this oxide is ()