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对一些化学题，根据解题需要，由质量守恒原理，可对物质的分子式（化学式）及反应过程等巧妙地进行变换，人为地进行“拆分”或“加合”处理，就可找到解题的捷径．。化学式作形如“N2O42NO2”的变换根据解题需要，把分子式论学式）作“拆分”或“加合”处理．如将BaCI2认为是
For some chemical problems, based on the principle of conservation of mass, according to the needs of problem solving, the molecular formulas (chemical formulas) and reaction processes of the substances can be subtly transformed, and the solutions can be found by artificially “splitting” or “additional” processes. Shortcut to the title. . Chemical formulas such as the “N2O42NO2” transformation according to the problem-solving need, the “molecular formula theory” for “split” or “additional” processing. If BaCI2 thinks it is