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【简答题】
推进器中还原剂肼（N 2 H 4 ）和强氧化剂液态双氧水。当它们混合反应时，即产生大量氮气和水蒸气，并放出大量热。已知0.4mol液态肼与足量液态双氧水反应，生成氮气和水蒸气，放出256.652KJ的热量。 （1）写出过氧化氢的电子式 。 （2）该反应的热化学方程式为 。 1mol肼完全反应转移电子数 。 （3）此反应用于火箭推进，除释放大量热和快速产生大量气体外，还有一个很大的优点是 。 （4）又已知H 2 O(l)==H 2 O(g)；△H = +44kJ?mol -1 ，由16g液态肼与液态双氧水反应生成液态水时放出的热量是 kJ。
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