问题 填空题

(6分)合成气经压缩升温后进入10m3甲醇合成塔,在催化剂作用下,进行甲醇合成,主要反应是:2H2(g) + CO(g) CH3OH(g) △H =-181.6kJ·mol-1。T4℃下此反应的平衡常数为160。此温度下,在密闭容器中加入CO、H2,反应到某时刻测得各组分的浓度如下:

物质H2COCH3OH
浓度/(mol·L10.20.10.4
⑴比较此时正、逆反应速率的大小:v        v(填“>”、“<”或“=”)。

⑵若加入同样多的CO、H2,在T5℃反应,10 min后达到平衡,此时c(H2)=0.4 mol·L1,则该时间内反应速率v(CH3OH) =              mol·(L·min)1

⑶生产过程中,合成气要进行循环,其目的是                                  

答案

⑴ >  ⑵ 0.03 mol·L1·min1 ⑶ 提高原料CO、H2的利用率(或提高产量、产率亦可)。

(1)根据物质的浓度可知,此时<160,所以反应向正反应方向进行,即正反应速率大于逆反应速率。

(2)根据(1)可知,起始时氢气的浓度是1.0mol/L,所以在(2)中氢气的浓度变化量是0.6mol/L,则生成甲醇是0.3mol/L,则甲醇的反应速率是0.3mol/L÷10min=0.03 mol·L1·min1

(3)生产过程中,合成气进行循环,可以提高原料CO、H2的利用率。

阅读理解

阅读理解。

     Dick lived in England. One day in January he said to his wife,  "I'm  going  to  fly to New York next

week because I've got some work there." "Where are you going to stay there?" his wife asked. "I don't

know yet." Dick answered. "Please send me your address from  there  in a telegram," his wife said. "All

right," Dick answered.

     He flew to New York on January 31st  and  found  a  nice hotel in the center of the city.  He put his

things in his room and then he sent his wife a telegram. He put the address of his hotel in it.

      In the evening he didn't  have any work,  so he went to a cinema. He came out at nine o'clock and

said, "Now I'm going back  to  my hotel and have a nice dinner.  "He found  a  taxi  and the driver said,

"Where do you want to go?" But Dick didn't remember the name and address of his hotel.

     "Which hotel are my things in?" he said, "And what am I going  to  do tonight?" But the driver of the

taxi did not know. So Dick got out and went into a post office. There he sent his wife another telegram,

and in it he wrote, "Please send me my address at this post office."

1. Dick flew to New York because ___.

A. he went there for a holiday                

B. he had work there

C. he went there for sightseeing              

D. his home was there

2. Why did his wife want a telegram from him? _________

A. Because she didn't know his address yet.    

B. Because she wanted to go to New York, too.

C. Because she might send him another telegram.

D. Because she couldn't leave her husband by himself in New York.

3. Where did Dick stay in New York?__________

A. In the center of the city.                  

B. In a hotel.

C. In a restaurant.                        

D. At his friend's house.

4. Who would send him the name and address of his hotel?__________

A. The manager of his hotel.        

B. The police office.

C. The taxi driver.                  

D. His wife.

5. Which of the following is not true?_________

A. Dick stayed at a nice hotel in the center of the city.

B. Dick didn't work on the first night of his arrival.

C. Dick forgot to send his wife a telegram.

D. Dick wanted to go back to his hotel in a taxi.

选择题