标准状况下，一个装满O2的容器的质量为79g，若装满氮气时质量是71g，盛满某气体X时，质量为103g．试计算：
（1）此容器的容积
（2）气体X的相对分子质量．
（3）该状况下该容器中盛满氯气时的总质量．
（1）假设容器的体积为VL，质量为m，
则有：m+
×32g/mol=79g，m+VL 22.4L/mol
×28g/mol=71g，VL 22.4L/mol
解之得：V=44.8，m=15g，
答：此容器的容积为44.8L；
（2）盛满某气体X时，质量为103g，设气体X的摩尔质量为M，
则有：15g+
×M=103g，44.8L 22.4L/mol
解之得：M=44g/mol，
答：气体X的摩尔质量为44g/mol；
（3）在标况下该容器中盛满氯气时的总质量为：15g+
×71g/mol=157g，44.8L 22.4L/mol
答：在标况下该容器中盛满氯气时的总质量为157g．
This year, about 2,300 teenagers from all over the world will spend about 10 months in US homes. At the same time about 1,300 American teenagers will go to other countries to learn new languages and learn the rest of the world. Here is a 2-way student exchange in action. Fred, 19, spent last year in Germany with George’s family. In turn, George’s son Mike spent a year in Fred’s home in America. Fred, a lively young man, knew little German when he arrived. But after 2 months of studying, the language became easy for him. School was completely different from what he had expected and it was much harder. Students rose respectfully when the teacher entered the room. They took 14 subjects instead of 6 that were usually taken in the US. Family life, too, was different. They have to listen to their fathers. All the activities were done with the family rather than individually. Fred found the food to be too simple at first. He also missed having a car. “Back home, you pick up some friends in a car and go out to have a good time. In Germany, you walk but you soon learn to like it. ” At the same time, in America, Mike, a friendly German boy, was also forming his own ideas. “I suppose I should criticize American schools. ” he says, “It is far too easy for our level but I have to say that I like it a lot in Germany, we do nothing but study. Here we take part in many other activities. I think that maybe American schools are better in training their citizens. There ought to be some middle ground between the two. __小题1:____ between American school life and German school life
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