已知H﹣H键能为436KJ•mol﹣1，H﹣N键能为391KJ•mol﹣1，根据化学方程式：N2（g）+3H2（g）⇌2NH3（g）△H=﹣92.4KJ•mol﹣1；则N≡N键的键能是

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已知H﹣H键能为436KJ•mol^﹣¹，H﹣N键能为391KJ•mol^﹣¹，根据化学方程式：N₂（g）+3H₂（g）⇌2NH₃（g）△H=﹣92.4KJ•mol^﹣¹；则N≡N键的键能是（）

A：431 kJ•mol^﹣¹

B：945.6 kJ•mol^﹣¹

C：649.6 kJ•mol^﹣¹

D：869.6 kJ•mol^﹣¹

上一题下一题 0.0难度选择题更新时间:2017-08-07 12:02:30

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B

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(Mr. Zhang is showing Wei Fang and Li Lei a modern factory.)
Mr. Zhang: You can’t see many workers here, but you can see a lot of robots. Look, that robot has two big hands.
Wei Fang: How strong it looks!
Mr. Zhang: Yes. It does much work for us.
Li Lei: There are so many big boxes here. What are the robots doing?
Mr. Zhang: They are making fridges.
Wei Fang: How fast they are working!
Li Lei: How much time do they need to make a fridge, Mr. Zhang?
Mr. Zhang: About five minutes.
Wei Fang and Li Lei: Only five minutes! What a modern factory it is!

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