化学计算是借助于用数学计算的知识,从量的方面来对化学的概念或原理加深理解或通过计算进一步掌握物质的性质及其变化规律。另外,通过计算还能培养分析、推理、归纳等逻辑思维能力和解决实际问题的能力。化学式是初中化学重要的知识点,对化学式概念的理解及有关化学式的计算技能的掌握,具有承上启下的作用。不仅是分子、元素、原子知识的巩固、应用、加深,而且是继续学习氢、碳、铁、酸、碱、盐、 With the aid of mathematical knowledge, stoichiometry is to deepen understanding of the concept or principle of chemistry in terms of quantity or to further understand the nature of matter and its variation by calculation. In addition, through the calculation can also develop analytical, reasoning, inductive and other logical thinking ability and ability to solve practical problems. Chemical formula is an important knowledge of junior high school chemistry point of view, understanding of the concept of chemical formulas and the calculation of chemical formula mastery, has the function of enlightenment. It is not only the consolidation, application and deepening of the knowledge of molecules, elements and atoms, but also the continuous study of hydrogen, carbon, iron, acid, alkali, salt,