问题 选择题

(2011·山东莘县高二期末)图Ⅰ是NO2(g)+CO(g)CO2(g)+NO(g)反应过程中能量变化示意图。一定条件下,在固定容积的密闭容器中该反应达到平衡状态。当改变其中一个条件X,Y随X的变化关系曲线如图Ⅱ;

下列有关说法正确的是(  )

A.该反应的焓变ΔH=+234 kJ·mol1

B.若X表示体系的压强,则Y表示的可能是NO2的转化率

C.若X表示温度则Y表示的可能是CO2物质的量浓度

D.增大CO的起始浓度,平衡向正反应方向移动,反应热增大

答案

答案:C

由图Ⅰ可知,该反应的焓变为ΔH=-234 kJ·mol-1,A错误;增大压强,平衡不移动,NO2的转化率不变,B错误;正反应为放热反应,升高温度,平衡向逆反应方向移动,CO2物质的量浓度减小,C正确;增大CO的起始浓度,虽然平衡向正反应方向移动,放出的热量增加,但反应热不变,D错误。

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A.237 Rockledge St. Syracuse, NY. 13224

B.404 Snow Road, Syracuse, NY. 13224

C.500 Park Drive, DeWitt, NY. 13214

D.19 South 8th St. NY. 13214小题2:If you dislike working on Sundays, being a ______ should be your best choice.

A.cook

B.secretary

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D.veterinarian assistant小题3: If you want to get a job at ______, you must have office skills.

A.Martin’s Apparel

B.East Side Management

C.Wales Charter School

D.Johnson-Marks Animal Hospital