选择题 一定条件下，下列反应中水蒸气含量随反应时间的变化趋势符合下图的是( )
![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/cwn505udwtf.png\" style=\"vertical-align:middle;\"> ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/i04alsfrdsh.png\" style=\"vertical-align:middle;\">
温度（T）的影响 压强（p）的影响
A．CO2( 91ExaM.orgg)+2NH3(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\">CO(NH2)2(s) + H2O(g)；△H＜0
B．CO2(g)+ H2(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\">CO(g) + H2O(g)；△H＞0
C．CH3CH2OH(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\"> CH2=CH2(g) + H2O(g)；△H＞0
D．2C6H5CH2CH3(g) + O2(g )![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\"> 2C6H5CH=CH2(g) + 2 H2O(g)；△H＜0
选择题 一定条件下，下列反应中水蒸气含 量随反应时间的变化趋势符合下图的是( )
![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/cwn505udwtf.png\" style=\"vertical-align:middle;\"> ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/i04alsfrdsh.png\" style=\"vertical-align:middle;\">
温度（T）的影响 压强（p）的影响
A．CO2(g)+2NH3(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\">CO(NH2)2(s) + H2O(g)；△H＜0
B．CO2(g)+ H2(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\">CO(g) + H2O(g)；△H＞0
C．CH3CH2OH(g) ![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\"> CH2=CH2(g) + H2O(g)；△H＞0
D．2C6H5CH2CH3(g) + O2(g )![]()
600)makesmallpic(this,600,1800);\' src=\"http://www_php168_com/91files/2016060703/1tahsgnab14.png\" style=\"vertical-align:middle;\"> 2C6H5CH=CH2(g) + 2 H2O(g)；△H＜0
本题答案：A
本题解析：根据图像可知，T2大于T1，P1大于P2。温度高水蒸气的含量降低，说明升高温度平衡向逆反应方向移动，即正反应是放热反应；压强增大，水蒸气的增大，说明增大压强，平衡向正反应方向移动，即正反应是体积减小的，所以答案选A。
本题所属考点：【化学平衡】
本题难易程度：【一般】
Bear with evil,and expect good. 坏事要忍，好事要等。
