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由烷基镁热分解制得镁的氢化物。实验测定，该氢化物中氢的质量分数为7.6%，氢的密度为0.101 g cm ?3 ，镁和氢的核间距为194.8 pm。已知氢原子的共价半径为37pm，Mg 2+ 的离子半径为72 pm。 ⑴ 写出该氢化物中氢的存在形式，并简述理由。 ⑵ 将上述氢化物与在一定条件下用球磨机研磨，可制得化学式为Mg 2 NiH 4 的化合物。X-射线衍射分析表明，该化合物的立方晶胞的面心和顶点均被镍原子占据，所有镁原子的配位数都相等。推断镁原子在Mg 2 NiH 4 晶胞中的位置(写出推理过程)。 ⑶ 实验测定，上述Mg 2 NiH 4 晶体的晶胞参数为646.5 pm，计算该晶体中镁和镍的核间距。已知镁和镍的原子半径分别为159.9 pm和124.6 pm。 ⑷ 若以材料中氢的密度与液态氢密度之比定义储氢材料的储氢能力，计算Mg 2 NiH 4 的储氢能力（假定氢可全部放出；液氢的密度为0.0708 g·cm -3 ）。
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