题干

CO和H2的混合气体俗称合成气,是一种重要的工业原料气,工业上利用天然气(主要成分为CH4)与水进行高温重整制备合成气.
(1)已知:CH4、H2和CO的燃烧热(△H)分别为﹣890.3kJ/mol、﹣285.8kJ/mol和﹣283.0kJ/mol,且1mol液态水汽化时的能量变化为44.0kJ.用1m3(标准状况)的甲烷与水蒸气在高温下反应制取合成气所需的热量为____ (保留整数).
(2)在一定温度下,向体积为2L的密闭容器中充入0.40mol CH4和0.60mol H2O(g),测得CH4(g)和H2(g)的物质的量浓度随时间变化如下表所示:
浓度
时间/min
物质
0
1
2
3
4
CH4
0.2mol•L1
0.13mol•L1
0.1mol•L1
0.1mol•L1
0.09moˉL1
H2
0mol•L1
0.2mol•L1
0.3mol•L1
0.3mol•L1
0.33mol•L1
①计算该反应第一次达平衡时的平衡常数K=____ .
②3min时改变的反应条件是____ (只填一种条件的改变即可).
(3)已知温度、压强、投料比X[
n
C
H
4
n
H
2
O
]对该反应的影响如图所示.
①图1中的两条曲线所示投料比的关系X1____  X2(填“=”、“>”或“<”下同).
②图2中两条曲线所示的压强比的关系:P1____  P2
(4)以天然气(设杂质不参与反应)、KOH溶液为原料可设计成燃料电池:
①放电时,负极的电极反应式为____ .
②设装置中盛有100.0mL 3.0mol/L KOH溶液,放电时参与反应的氧气在标准状况下的体积为8.96L,放电过程中没有气体逸出,则放电完毕后,所得溶液中各离子浓度由大到小的关系为____ .
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答案(点此获取答案解析)

9201kJ,0.135,\u5347\u9ad8\u6e29\u5ea6\u6216\u589e\u5927H2O\u7684\u6d53\u5ea6\u6216\u51cf\u5c0fCO\u7684\u6d53\u5ea6\u3000,\uff1e,\uff1e\u3000,CH4\ufe638e\ufe63+10OH\ufe63=CO32\ufe

同类题3

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项

    He's an old cobbler(修鞋匠) with a shop in the Marais, a historic area in Paris. When I took him my shoes, he at first told me: “I haven't time. Take them to the other fellow on the main street; he'll fix them for you right away.”

    But I'd had my eye on his shop for a long time. Just looking at his bench loaded with tools and pieces of leather, I knew he was a skilled craftsman(手艺人). “No,” I replied, “the other fellow can't do it well.”

    “The other fellow” was one of those shopkeepers who fix shoes and make keys “while-U-wait” — without knowing much about mending shoes or making keys. They work carelessly, and when they have finished sewing back a sandal strap(鞋带), you might as well just throw away the pair.

    My man saw I wouldn't give in, and he smiled. He looked at my shoes, had me write my name on one shoe with a piece of chalk and said, “Come back in a week.”

    I was about to leave when he took a pair of soft leather boots off a shelf.

    “See what I can do?” he said with pride. “Only three of us in Paris can do this kind of work.”

    When I got back out into the street, the world seemed brand-new to me. He was something out of an ancient legend, this old craftsman with his way of speaking familiarly, his very strange, dusty felt hat, his funny accent from who-knows-where and, above all, his pride in his craft.

    These are times when nothing is important but the bottom line, when you can do things any old way as long as it “pays”, when, in short, people look on work as a path to ever-increasing consumption(消费) rather than a way to realize their own abilities. In such a period it is a rare comfort to find a cobbler who gets his greatest satisfaction from pride in a job well done.