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阿佛加得罗常数是高中化学的学习重点,也是各种考试的热点,由于它和物质的质量、物质的量、气体的体积等多个物理量联系,历来都受到命题人的关注.一、阿佛加得罗常数型题目中的常见陷阱1.用“22.4L/mol”时没注意前提条件例1.常温时,11.2L的CH4气体含有4N A个氢原子.析:标准状况时,1mol气体中含N A个分子。常温时气体的摩尔体积大于22.4L/mol,故常温时11.2L的CH4气体小于0.5mol,所含
Avogadro’s constant is the focus of high school chemistry, but also a hot spot for all kinds of examinations, which has always been paid attention to by proponents due to its connection with a number of physical quantities, such as the mass of matter, the amount of matter, the volume of gas, etc. First, Common Trap in the Avogadro’s Constant Type Problem 1. No attention was paid to “22.4 L / mol” Preconditions Example 1. 11.2N CH4 gas contains 4N A hydrogen atoms at room temperature Analysis: Standard conditions When, 1mol gas contains NA molecules. The molar volume of gas at room temperature is greater than 22.4L / mol, so at room temperature 11.2L CH4 gas is less than 0.5mol, containing