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质量守恒定律是化学反应中的普遍规律,是根据化学方程式解题的依据,化学计算中有时因产生气体、生成沉淀,会出现似
The law of conservation of mass is a universal law in chemical reactions. It is the basis for solving problems according to the chemical equations. Sometimes gas may be generated in the chemical calculations and precipitates may appear.