题干

氨是重要的化工产品之一,研究合成氨反应具有重要意义.σ
(1)已知断裂下列化学键需要吸收的能量分别为:N≡N 946.0kJ•mol﹣1、H﹣H 436kJ•mol﹣1、N﹣H 390.8kJ•mol﹣1,写出以N2(g)和H2(g)为原料合成NH3(g)的热化学方程式____ 
(2)某小组研究了其他条件不变时,改变某一条件对上述反应的影响,实验结果如图1所示:
①t1时刻改变的条件为____ 
②t2时刻,恒压充入氦气,t3时刻达到平衡.在图中画出t2时刻后的速率变化图象.
(3)相同温度下,A、B、C三个密闭容器,A、B恒容,C带有可自由移动的活塞K,各向其中充入如图2所示反应物,初始时控制活塞K,使三者体积相等,一段时间后均达到平衡.
①达到平衡时,A、C两个容器中NH3的浓度分别为c1、c2,则c1____ c2(填“>”、“<”或“=”).
②达到平衡时,若A、B两容器中反应物的转化率分别为α(A)、α(B),则 α(A)+α(B)____ 1(填“>”、“<”或“=”).
③达到平衡时,若容器C的体积是起始时的
3
4
,则平衡时容器C中H2的体积分数为____ 
(4)直接供氨式碱性燃料电池(DAFC),以KOH溶液为电解质溶液,其电池反应为 4NH3+3O2═2N2+6H2O,则负极的电极反应式为____ 
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答案(点此获取答案解析)

N2\uff08g\uff09+3H2\uff08g\uff09\u21cc2NH3\uff08g\uff09\u25b3H=\ufe6390.8 kJ\u2022mol\ufe631,\u5347\u9ad8\u6e29\u5ea6,\uff1c,\uff1c,50%\u3000,2NH3\ufe636e\ufe63+6OH\u

同类题2

任务型阅读

    Small talk is the short conversations we have at parties, while we wait in line at the store, at family events or work. Sometimes we make small talk with people we already know but not well. Often we have to make small talk with complete strangers.____ Here are some tips to improve your small-talking ability.

    ⒈____

    If you have seen a really good movie or have read a really good book, you can talk about that.

    When you are sharing the same experience with someone, it's easy to start a conversation. You simply notice and comment on what's going on around you. For example, if you are at a party and a song comes on that you like or that reminds you of something, you can talk about that.

    ⒉Ask open-ended questions

    These types of questions require more thought and more than a simple one-word answer.____ the conversation will go on longer.

    ⒊Become a student

    Nobody knows everything. So,as someone is answering one of your open-ended questions, they bring up something about which you know nothing. So, tell them! This lets the other person become the teacher.____ It's a win-win situation.

    Like anything, getting good at making small talk takes practice.____you might become happier. If you are making small talk using English, you will most definitely improve your speaking and listening skills.

A. Have some conversation starters ready

B. If you make small talk in your native language

C. However, some people are not good at small talk

D. If you ask questions that need more details to answer

E. You can talk about something that you recently learned

F. Many people find these small conversations about random topics easy

G. They feel good about sharing their knowledge and you get to learn something