论文部分内容阅读
一、添加系数法例1.等质量CO与CO2,氧元素质量比是_______;氧元素质量相等时,CO与CO2的质量比是_________。解析:CO与CO2相对分子质量不相等,两种物质质量相等时,分子个数则不一样。可用相对分子质量数值交叉在化学式前面配化学计量数,即44 CO分子与28CO2分子质量相等,则氧元素质量比为11:14:而要使氧元素质量相等,氧原子个数必相等,即2CO分子与CO2分子含氧原子个数一样多,则CO与CO2质量比为14:11。
First, the addition of the law Legislation 1. Equal quality of CO and CO2, the mass ratio of oxygen is _______; when the mass of oxygen is equal, the mass ratio of CO to CO2 is _________. Analysis: The relative molecular masses of CO and CO2 are not equal. When the mass of the two substances is equal, the number of molecules is not the same. Available relative molecular mass values cross the chemical formula in front of the stoichiometric number, that is, 44 CO molecules and 28 CO2 molecular mass are equal, then the mass ratio of oxygen elements is 11:14: and to make the oxygen element mass equal, the number of oxygen atoms must be equal, ie 2 CO molecules and CO2 molecules contain as many oxygen atoms, then the mass ratio of CO to CO2 is 14:11.