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（13分）工业合成氨是硝酸工业中的重要步骤，已知N 2 (g) +3H 2 (g) 2NH 3 (g) ΔH ＝－92.4kJ·mol － 1 。请回答： (1) 当合成氨反应达到平衡后，改变某一外界条件（不改变N 2 、 H 2 和NH 3 的量），反应速率与时间的关系如右图所示。 图中 t 1 时引起平衡移动的条件可能是 __ , t 3 时引起平衡移动的条件可能是 __ ___ , 其中表示平衡混合物中NH 3 的含量最高的一段时间是 。 (2) 温度为 T ℃时，将2a mol H 2 和a mol N 2 放入0.5L密闭容器中，充分反应后测得N 2 的转化率为50﹪。则该反应的化学平衡常数的值为 ___________________ 。请在答题卷上写出具体的 计算过程 。
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