问题 填空题

联氨(N2H4)及其衍生物是一类重要的火箭燃料,N2H4与N2O4反应能放出大量的热。

(1)已知:2NO2(g)=N2O4(g) △H=-57. 20 kJ/mol。一定温度下,在密闭容器中反应达到平衡。

其他条件不变时,下列措施能提高NO2转化率的是_____________ (填字母)。

A.减小NO2的浓度 B.降低温度  C.增加NO2的浓度 D.升高温度

(2)25℃时,1 00 g N2H4(1)与足量N2O4(l)完全反应生成N2(g)和H2O(l),放出19.14 kJ的热量。则反应2N2H4(1)+N2O4(1)=3N2(g) +4H2O(1)的△H=____kJ/mol

(3)17℃、1.01×l05Pa,密闭容器中N2O4和NO2的混合气体达到平衡时,c(NO2) =0. 030 0 mol/L、c(N2O4)=0.0120 mol/L。计算反应的平衡常数K。_______________________

(4)现用一定量的Cu与足量的浓HNO3反应,制得1.00 L已达到平衡的N2O4和NO2的混合气体(17℃、1.01×105Pa),理论上至少需消耗Cu多少克?________________________________________

答案

(1)BC

(2) -1224.96

(3)根据题意知平衡时:c(N2O4)=0.012 0 mol/L c( NO2)=0.030 0 moI/L

答:平衡常数为13.3。

(4)由(3)可知,在17℃、1. 01×105 Pa达到平衡时,l.00 L 混合气体中:

n(N2O4)=c(N2O4)×V=0.0120 mol/L ×l.00L=0.0120 mol

n( NO2)=c( NO2)×v=0.0300 mol/L×l.00 L =0.0300 moI

则n总( NO2)=n(NO2) +2×n(N2O4)=0.0540 mol

由Cu+4HNO3=Cu(NO3)2+2NO2↑ +2H2O可得

答:理论上至少需消耗Cu l.73 g。

阅读理解
阅读理解,并填表。
   
    From 8:30pm to 9:30 pm on Saturday, March 26th, 2011, a great number of people around the
world turned off the lights for Earth Hour. It is a bit like an environmental New Year, providing a
chance to help care for our earth and make people around the world learn how important it is to do
that.
     What can do during this hour? We can do lots of run things in the dark, such as planning a
candlelight dinner for our family or a group of friends, telling stories and singing songs with the
kids and neighbors.
     What did you do for Earth Hour this year? Let's share the Earth Hour stories.

Emma
I was on one of the mountains near the city and took photos of my city. It was great to
watch the stars and the moon after a busy day so that I could enjoy this relaxing moment.

Albert
I work as a waiter in a restaurant. Our restaurant was still open even for Earth Hour as we got lots
of reservations (预定) that night. So we spent the hour working by candlelight. And guess what? Our
customers loved that and promised to come for next Earth Hour.

 Brandon
I turned off the main power to my house and went for a walk for Earth Hour. It was a little
strange to walk in the dark, but it was only for one hour. Just think of what it must have been
like before the invention of the light bulb!

Mary 
I invited my friends who know and support Earth Hour activities. We actually had a candlelight
concert and we talked about the old happy days that we spent together in college.
The date of Earth Hour in 2011 1_______
Albert's job 2_______
What Brandon did when it was dark3_______
Who stayed with Mary during the hour4_______
The number of people who talked about their stories5_______
单项选择题 A1/A2型题