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【简答题】
在化学反应中，只有极少数能量比平均能量高得多的反应物分子发生碰撞可能发生化学反应，这些分子称为活化分子，使普通分子变成活化分子所需提供的最低限度的能量叫活化能，其单位通常用kJ/mol表示。请认真观察下图，然后回答问题： （1）图中所示反应是_____________（填“吸热”或“放热”）反应，该反应的△H＝____________ kJ·mol -1 （用含E1、E2的代数式表示）。 （2）已知热化学方程式：H 2 (g)＋1/2O 2 (g)＝H 2 O(g) △H＝－241.8kJ·mol - 1。该反应的活化能为167.2kJ·mol -1 ，则其逆反应的活化能为_________kJ·mol -1 。 （3）对于同一反应，图中虚线（Ⅱ）与实线（Ⅰ）相比，活化能大大降低，活化分子的百分数增多，反应速率明显加快，你认为最可能的原因是______________。
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to make vivid to the reader the horrifying sufferings Mac had to endure
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