根据物质各元素的质量或元素的质量百分比组成和该物质的分子量,要求分子式中所含各元素的原子数,从而确定该物质的分子式,其方法有三: 一、由最简式求分子式由各元素的质量(或百分组成)除以该元素的原子量的比,便可求出分子中各元素原子数的最简比。再用分子量除以最简式式量所得的商,乘以最简式便可得出分子式。 According to the quality of the elements of each element or the mass percentage of the composition of the mass and the molecular weight of the material, requiring elements contained in the atomic number of each element to determine the molecular formula of the material, there are three ways: First, The elemental mass (or percent composition) divided by the atomic weight ratio of the element gives the simplest ratio of the number of atoms in each element of the molecule. Then the molecular weight divided by the most simple type of quotient obtained by multiplying the most simple formula can be drawn.