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（6分）拆开1mol H—H键，1mol N—H键，1mol N三N键分别需要吸收的能量为436kJ ,391kJ，946kJ：则理论上，每生成1mol NH 3 ， 热量（填：吸收或放出） kJ；事实上，反应的热量总小于理论值，为什么？
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