第63章 阿伏伽德罗常数NA(第1页)
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只见电脑的界面上突然就显现出了一道题,还是最难理解透彻的化学。作为后羿的英雄玩家,他对于理科题是一窍不通,又怎么会去解答呢。
不过,虽然他是上课没有认真听讲,但是下了课他却是在很扎实的复习。还是试一试吧,万一答对了,就可以进攻接下来的一个防御塔了。
只见题目是必修一的化学,有关于物质的量的一道选择题。
用na表示阿伏伽德罗常数的值。下列叙述中不正确的是
a。分子总数为na的no2和neta
B。28g乙烯和丁烷的混合气体中含有的碳原子数为2na
net2o4混合气体含有的原子数为6na
d。常温常压下,22。4L**与足量镁粉充分反应,转移的电子数为2na
我的个天呐,后羿看完题目之后,那是一脸的懵逼。现在又能怪得了谁,要怪就只能怪自己当初没有好好听讲了。
虽然觉得看上去很是头痛,但是你把它要所涉及的考点思路整理清楚,就算再难的题,也都会迎刃而解了。
主要考查的是阿伏伽德罗常数、物质的量、气体摩尔体积、氧化还原反应电子转移数目的计算,这个后羿还是知道的。
他开始逐一排查,哪怕去掉一个错误的答案,那么都将会有利于自己接下来的解答。先看a选项,分子数为na的no2和neto2为xmo1,co2为ymo1,则x+y=1mo1,则氧原子总物质的量为:2x+2y=2mo1,则氧原子数为2na,正确;B。乙烯和环丁烷的最简式相同,均为ch2,因此,28g乙烯和环丁烷的混合气体中含有的碳原子数为2na,正确;neto2,因此,常温常压下,92g的no2和n2o4混合气体含有的原子数为6na,正确;d。应为标准状况下,错误。
后羿看出了这道题的端倪,直接在大脑中以最快的度一口气给列算了出来,他直接点了d提交了上去。
系统审核中,倒计时5秒。
随着时间的结束,恭喜您,回答正确,就这样,敌方算是推掉了我方的一个塔。
插一句,真心不错,值得装个,毕竟可以缓存看书,离线朗读!
刚巧,李虎操作的亚瑟已经在不知不觉中来到了后羿背后的一片草丛中。这是典型的后羿射塔,亚瑟在后啊。
趁着后羿兴奋的样,亚瑟突然纵身一跃,用尽了所有的攻击力打在了他的身上。别看亚瑟已经送出去了两个人头,可是他有时候的威力也不容小觑。对付后羿这种英雄,只能偷袭,不能硬上。人家可是射手,攻击范围大,一时半会还近不了他身,所以说偷袭才是王道。
眼看着亚瑟打的挺凶猛,敌方的典韦却是带着一路人马,两个小兵,一个炮车,来到了亚瑟刚才所埋伏的草丛里。(未完待续)
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