题干

在温度相同、容积均为2L的3个恒容密闭容器中,按不同方式投入反应物,保持恒温,测得反应达到平衡时的有关数据如下,下列说法正确的是(   )

反应物投入量

1moN2、3mol H2

2mol N2、6mol H2

2mol NH3

NH3浓度(mol•L1

c1

c2

c3

反应的能量变化

放出Q1kJ

放出Q2kJ

吸收Q3kJ

体系压强(Pa)

p1

p2

p3

反应物转化率

α1

α2

α3

(已知N2(g)+3H2(g)=2NH3(g)△H=﹣92.4kJ•mol1

A:2p1=2p3>p2

B:α23<1

C:达到平衡时丙容器中NH3的体积分数最大

D:Q1+Q3>92.4

上一题 下一题 0.0难度 选择题 更新时间:2013-11-11 09:35:37

答案(点此获取答案解析)

A

同类题3

阅读下面的文言文,完成下列小题。

    胡广,字广大,吉水人。父子祺,字寿昌,以字行。陈友谅陷吉安,太祖遣兵复之,将杀胁从者千余人。子祺走帅,力言不可,得免。洪武三年,以文学选为御史,上书请都关中。帝称善,遣太子巡视陕西。后以太子,不。子祺出为广西按察佥事,改知彭州。所至平冤狱,毁淫祀,修废堰,民甚德之。迁延平知府,卒于任。广,其次子也。建文二年,廷试。时方讨燕,广对策有“亲籓陆梁,人心摇动”语,帝亲擢广第一,赐名靖,授翰林修撰。

    成祖即位,广偕解缙迎附。擢侍讲,改侍读,复名广。迁右春坊右庶子。永乐五年,进翰林学士,兼左春坊大学士。帝北征,与杨荣、金幼孜从。数召对帐殿,或至夜分。过山川厄塞,立马议论,行或稍后,辄遣骑四出求索。尝失道,脱衣乘骣马渡河,水没马及腰以上,帝顾劳良苦。广善书,每勒石,皆命书之。十二年北征,皇长孙从,命广与荣、幼孜军中讲经史。十四年进文渊阁大学士,兼职如故。帝征乌思藏僧作法会,为高帝、高后荐福,言见诸祥异。广乃献《圣孝瑞应颂》,帝缀为佛曲,令宫中歌舞之。礼部郎中周讷请封禅,广言其不可,遂不。广性缜密。帝前所言及所治职务,出未尝告人。时人以方汉胡广。然颇能持大体。奔母丧还朝,帝问百姓安否。对曰:“安,但郡县穷治建文时奸党,株及支亲,为民厉。”帝纳其言。十六年五月卒,年四十九。赠礼部尚书,谥文穆。文臣得谥,自广始。丧还,过南京,太子为致祭。仁宗立,加赠广少师

(节选自《明史·胡广传》)

同类题4

阅读理解

    A few years ago, I took a sightseeing trip to Washington, DC. I saw many of our nation's treasures, and I also saw a lot of citizens on the street—unfortunate ones, like beggars and homeless folks.

    Standing outside the Ronald Reagan Center, I heard a voice ask. “Can you help me?” When I turned around, I saw an old blind woman with her hand extended. In a natural reflex (自然反射), I reached into my pocket, pulled out all of my loose change and placed it in her hand without even looking at her. I hated being disturbed by a beggar.

    But the blind woman smiled and said: “I don't want your money. I just need help finding the post office.” In an instant, I realized what I had done. I had acted with prejudice (偏见)---I had judged another person simply for what I thought she had to be.

    I hated what I saw in myself. This incident brought back my central belief. It reminded me that I believed in being humble (卑下的), even though I'd lost that belief for a moment.

    The thing I had forgotten about myself is that I am an immigrant (移民). I left Honduras and arrived in the US at the age of 15. I started my new life with two suitcases, my brother, my sister and a strong mother. Through the years, I have been a dish washer, roofer, mechanic, cashier and pizza delivery driver, among many other humble jobs. Eventually, I became a network engineer.

    In my own life, I have experienced many acts of prejudice. I remember a time at age 17---I was busboy (餐馆工), and I heard a father tell his little boy that if he did not do well in school, he would end up like me. I have also seen the same treatment of family and friends, so I know what it's like, and I should have known better.

    But now, living my American middle-class lifestyle, it is too easy to forget my past, to forget who I am and where I have been, and to lose sight of where I want to go. The blind woman cured me of my blindness. She reminded me of my belief in being humble, and to always keep my eyes and heart open.

    By the way, I helped that lady to the post office. And in writing this essay, I hope to thank her for the priceless lesson she gave me.