氢气在氯气中燃烧。已知断开1 molH-H键消耗的能量为Q1 kJ, 断开1 mol Cl-Cl键消耗的能量为Q2 kJ, 形成1 mol H-Cl键释放的能量为Q3 kJ，下列关系式正确的是

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氢气在氯气中燃烧。已知断开1 molH-H键消耗的能量为Q₁ kJ,

断开1 mol Cl-Cl键消耗的能量为Q₂ kJ, 形成1 mol H-Cl键释放的能量为Q₃ kJ，下列关系式正确的是

A：Q₁+Q₂<2Q₃

B：Q₁+Q₂>2Q₃

C：Q₁+Q₂<Q₃

D：Q₁+Q₂=Q₃

上一题下一题 0.0难度选择题更新时间:2017-05-10 10:25:42

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A

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It was a Monday morning. When a teacher walked into the1, he heard a low voice: “Here is the teacher. I am 2this boring fellow(烦人的家伙) is going to talk about putting in commas(逗号).” It was a boy's3. His name was Bill. He was talking4the boy next to him. The teacher didn't get angry. He said5about it, then he really began to talk about putting in commas, and then he wrote6the sentence: “Bill says the teacher is a boring fellow.” The class7and Bill's face8red. “Now,” said the teacher, “I'll 9you how important commas are.”

He put two commas in the sentence, and now read, “10is a boring fellow.”

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