题目内容
苯乙烷(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-C2H5)可生产塑料单体苯乙烯(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-CH=CH2),其原理反应是:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-CH=CH2(g)+H2(g);△H=+125kJ?mol-1.某温度下,将0.40mol
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137225525.png)
-C2H5(g)充入2L真空密闭容器中发生反应,测定该容器内的物质,得到数据如下表:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213722549959.png)
(1)n1=______mol,计算该反应的平衡常数,K=______.
(2)工业上常以高温水蒸气作为反应体系的稀释剂(不参与反应).
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-C2H5(g)的平衡转化率与水蒸气的用量、体系总压强的关系如图1所示.当其它条件不变时,水蒸气的用量越大,平衡转化率将______(填“越大”、“越小”或“不变”),原因是______.
(3)副产物H2用做氢氧燃料电池.写出酸性条件下,该电池正极的电极反应式______.
(4)在相同条件下,若最初向该容器中充入
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-CH=CH2(g)和H2(g),假设在40min时达到上述同样的平衡状态,请在图2中画出并标明该条件下
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-C2H5(g)和
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-CH=CH2(g)的浓度c随时间t变化的曲线______.
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-C2H5)可生产塑料单体苯乙烯(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-CH=CH2),其原理反应是:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137210525.png)
-CH=CH2(g)+H2(g);△H=+125kJ?mol-1.某温度下,将0.40mol
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137225525.png)
-C2H5(g)充入2L真空密闭容器中发生反应,测定该容器内的物质,得到数据如下表:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213722549959.png)
时间/min | 0 | 10 | 20 | 30 | 40 |
n(![]() -C2H5)/mol |
0.40 | 0.30 | 0.26 | n2 | n3 |
n(![]() -CH=CH2)/mol |
0.00 | 0.10 | n1 | 0.16 | 0.16 |
(2)工业上常以高温水蒸气作为反应体系的稀释剂(不参与反应).
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-C2H5(g)的平衡转化率与水蒸气的用量、体系总压强的关系如图1所示.当其它条件不变时,水蒸气的用量越大,平衡转化率将______(填“越大”、“越小”或“不变”),原因是______.
(3)副产物H2用做氢氧燃料电池.写出酸性条件下,该电池正极的电极反应式______.
(4)在相同条件下,若最初向该容器中充入
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-CH=CH2(g)和H2(g),假设在40min时达到上述同样的平衡状态,请在图2中画出并标明该条件下
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-C2H5(g)和
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137241525.png)
-CH=CH2(g)的浓度c随时间t变化的曲线______.
(1)20min时,
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5的物质的量为0.26mol,变化的物质的量为0.40mol-0.26mol=0.14mol,
根据方程式
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2(g)+H2(g)可知,
生成
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH20.14mol,
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2(g)+H2(g)
起始:0.40mol 0 0
转化:0.16mol 0.16mol 0.16mol
平衡:0.24mol 0.16mol 0.16mol
平衡时:c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5)=0.12mol/L,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2)=0.08mol/L,c(H2)=0.08mol/L,
k=
=0.053 mol?L-1,
故答案为:0.14; 0.053 mol?L-1;
(2)由化学方程式可知,增大压强,平衡向逆反应方向移动,则体系总压强一定时,水蒸气的分压越大,平衡体系的分压越小,平衡向气体体积增大的方向移动,所以转化率增大,
故答案为:大;体系总压强一定时,水蒸气的分压越大,平衡体系的分压越小,平衡向气体体积增大的方向移动;
(3)酸性氢氧燃料电池中,正极上氧气得电子发生还原反应,反应的电极方程式为O2+4H++4e-=2H2O,
故答案为:O2+4H++4e-=2H2O;
(4)在相同条件下,若最初向该容器中充入
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137288525.png)
-CH=CH2(g)和H2(g),假设在40min时达到上述同样的平衡状态,平衡时,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5)=0.12mol/L,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2)=0.08mol/L,c(H2)=0.08mol/L,起点(0,0.20)、终点在(40,0.08);苯乙烷曲线变化趋势在增大,弓向浓度轴,且起点(0,0)、终点(40,0.12),则图象为
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213730319354.png)
,故答案为:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213730319354.png)
.
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5的物质的量为0.26mol,变化的物质的量为0.40mol-0.26mol=0.14mol,
根据方程式
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2(g)+H2(g)可知,
生成
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH20.14mol,
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5(g)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256278.png)
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2(g)+H2(g)
起始:0.40mol 0 0
转化:0.16mol 0.16mol 0.16mol
平衡:0.24mol 0.16mol 0.16mol
平衡时:c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5)=0.12mol/L,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2)=0.08mol/L,c(H2)=0.08mol/L,
k=
0.08mol/L×0.08mol/L |
0.12mol/L |
故答案为:0.14; 0.053 mol?L-1;
(2)由化学方程式可知,增大压强,平衡向逆反应方向移动,则体系总压强一定时,水蒸气的分压越大,平衡体系的分压越小,平衡向气体体积增大的方向移动,所以转化率增大,
故答案为:大;体系总压强一定时,水蒸气的分压越大,平衡体系的分压越小,平衡向气体体积增大的方向移动;
(3)酸性氢氧燃料电池中,正极上氧气得电子发生还原反应,反应的电极方程式为O2+4H++4e-=2H2O,
故答案为:O2+4H++4e-=2H2O;
(4)在相同条件下,若最初向该容器中充入
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137288525.png)
-CH=CH2(g)和H2(g),假设在40min时达到上述同样的平衡状态,平衡时,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137256525.png)
-C2H5)=0.12mol/L,c(
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/20131203122137272525.png)
-CH=CH2)=0.08mol/L,c(H2)=0.08mol/L,起点(0,0.20)、终点在(40,0.08);苯乙烷曲线变化趋势在增大,弓向浓度轴,且起点(0,0)、终点(40,0.12),则图象为
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213730319354.png)
,故答案为:
![精英家教网](http://thumb.1010pic.com/pic2/upload/papers/20131203/2013120312213730319354.png)
.
![](http://thumb2018.1010pic.com/images/loading.gif)
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苯乙烷(
-C2H5)可生产塑料单体苯乙烯(
-CH=CH2),其原理反应是:
-C2H5(g) ![](http://thumb.1010pic.com/pic6/res/gzhx/web/STSource/20131031222706826417044/SYS201310312227068264170009_ST/images3.png)
-CH=CH2(g)+H2(g);△H=+125kJ?mol-1.某温度下,将0.40mol
-C2H5(g)充入2L真空密闭容器中发生反应,测定该容器内的物质,得到数据如下表:
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(2)工业上常以高温水蒸气作为反应体系的稀释剂(不参与反应).
-C2H5(g)的平衡转化率与水蒸气的用量、体系总压强的关系如图1所示.当其它条件不变时,水蒸气的用量越大,平衡转化率将______(填“越大”、“越小”或“不变”),原因是______.
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![](http://thumb.1010pic.com/pic6/res/gzhx/web/STSource/20131031222706826417044/SYS201310312227068264170009_ST/images0.png)
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时间/min | 10 | 20 | 30 | 40 | |
n(![]() | 0.40 | 0.30 | 0.26 | n2 | n3 |
n(![]() | 0.00 | 0.10 | n1 | 0.16 | 0.16 |
(2)工业上常以高温水蒸气作为反应体系的稀释剂(不参与反应).
![](http://thumb.1010pic.com/pic6/res/gzhx/web/STSource/20131031222706826417044/SYS201310312227068264170009_ST/images8.png)
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(4)在相同条件下,若最初向该容器中充入
![](http://thumb.1010pic.com/pic6/res/gzhx/web/STSource/20131031222706826417044/SYS201310312227068264170009_ST/images9.png)
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