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（10分）如图所示的转化关系中，已知A是由短周期元素组成的酸式盐。D．Y．H为气体，X为无色液体，G和K均是常见的强酸。H与Na 2 O 2 可发生化合反应，生成的盐与Ba 2 ＋ 反应可生成不溶于稀G的白色沉淀，一个D分子中含有10个电子。 请回答下列问题： （1）用电子式表示X的形成过程：____________________。 （2）写出D．H．X反应生成A的离子反应方程式：____________________。 （3）已知：2H（g）＋Y（g） 2I（g）； 。当加入4 mol H和2 mol Y后，放出345 kJ的热量时，H的转化率最接近于__________（填字母）。 A．40% B．50% C．80% D．90% （4）标准状况下在1000mL某密闭容器中装有440mL的C溶液，中加入3.9g Na 2 O 2 充分反应后恢复至原温度，发现容器内气体压强变为原来的1.5倍（忽略溶液体积变化），则原C溶液的物质的量浓度为__________mo1·L － 1 。（保留两位有效数字）
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