题干

合成氨工业对国民经济和社会发展具有重要的意义.其原理为:

N2(g)+3H2(g)⇌2NH3(g)△H=﹣92.4kJ/mol    据此回答以下问题:

(1)合成氨工业采取的下列措施中,不能用勒沙特列原理解释的是____ (填序号).

①20Mpa~50Mpa   ②500℃的高温    ③铁触媒作催化剂   ④将生成的氨液化并及时从体系中分离出来,未反应的N2、H2循环到合成塔中.

(2)一定条件下NH3的平衡体积分数随n(N2)变化如图所示

(T﹣温度).则T2____ T1(填>、=、<),判断的依据是:____ 

(3)写出该反应N2(g)+3H2(g)⇌2NH3(g) 的平衡常数表达式K= ____  .

上一题 下一题 0.0难度 选择题 更新时间:2019-07-22 06:03:37

答案(点此获取答案解析)

\u2461\u2462,\uff1c\u3000,\u5408\u6210\u6c28\u53cd\u5e94\u662f\u653e\u70ed\u53cd\u5e94\uff0c\u6e29\u5ea6\u5347\u9ad8\uff0c\u5e73\u8861\u5411\u9006\u53cd\u5e94\u65b9\u5411\u79fb\u52a8\uff0cNH3\u7684\u4f53\u79ef\u5206\u6570\u4e0b\u964d\uff

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    The rules about how to talk, eat and sit, which are highly limited, are observed in most Western restaurants and homes. ____ Many Westerners have no idea how to act at the Chinese dinner table. No forks or knives for them to use! The Chinese host makes great, sweeping arm movements that go over large sections of the table, passing over both food and friends alike. ____ However, it leaves many foreigners at a loss for what to do.

    In my childhood home, dinner was enjoyed with low voices, and the topics that we could discuss were very limited. ____ If I had to leave the table to use the toilet, I had to excuse myself without mentioning what it was that I was going to do. “May I be excused, please? I need to wash my hands.” I would say. My mother would say, “Sure.” My father would often play a joke on me by saying, “____

    As for eating, we did it quietly. No eating noises were allowed. Everything must be done as quietly as possible. If any sound was created by eating food or drinking, it would be considered as bad manners!

    ____He is to sit up straight with the recessive hand (usually the left) in one's lap holding a napkin while the dominant hand (usually the right) holds the fork or spoon. The only time one is allowed to have both hands on the table is when he is using a knife to cut something.

A. The scene is fantastic.

B. Your hands don't look dirty!

C. How one sits at the table is also prescribed.

D. Can't you think up a better excuse than that?

E. In general they were all strictly forbidden topics.

F. They're completely different from what we find here in China.

G. We were not allowed to talk about anything that made listeners uncomfortable.