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例题分析后,再对该类题型的解题方法或相关的知识进行总结,是高三化学的复习过程中的一重要做法.下面通过举例来说明我在这方面的点滴探索. 一、阿佛加德罗常数值题型: 例1 设NA表示阿加德罗常数,下列叙述中正确的是 (A)在标况下,11.2L氖气含有NA个氖原子 (B)在标况下,22.4L三氧化硫含有NA个三氧化硫分子 (C)金属镁与稀盐酸反应置换出1molH2,则有2NA个H+离子被还原 (D)在1L1mol·L-1盐酸中含有NA个氯
After the analysis of the example questions, a summary of the problem-solving methods or related knowledge of this type of questions is an important practice in the process of reviewing the chemistry of junior highs. Here is an example to illustrate my explorations in this area. The Gadero constant value question type: Example 1 Let NA denote the Ajadero constant. The correct one in the following description is (A) Under nominal conditions, 11.2 L helium contains NA helium atoms (B) under standard conditions. 22.4L of Sulfur Trioxide Contains NA Sulfur Trioxide Molecules (C) Metal Magnesium reacts with dilute hydrochloric acid to displace 1mol H2, and 2NA H+ ions are reduced (D) In 1L1mol·L-1 hydrochloric acid contains NA chlorine