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X、Y、Z、W均为10电子的分子或离子．X有5个原子核．通常状况下，W为无色液体．它们之间转化关系如图1所示，请回答： （1）工业上每制取1mol Z要放出46.2kJ的热量，写出该反应的热化学方程式：______． （2）工业制取Z的化学平衡常数K与T的关系如下表： T/K 298 398 498 … K/（mol?L -1 ） -2 4.1×10 6 K 1 K 2 … 请完成下列问题： ①试比较K 1 、K 2 的大小，K 1 ______K 2 （填写“＞”“=”或“＜”） ②恒温固定体积的容器中，下列各项能作为判断该反应达到化学平衡状态的依据的是______（填序号字母）． A．容器内各物质的浓度之比为化学计量数比B．混合气体密度保持不变 C．容器内压强保持不变 D．混合气体相对分子质量保持不变 （3）某化学小组同学模拟工业生产制取HNO 3 ，设计如图2所示装置，其中a为一个可持续鼓入空气的橡皮球． ①A中发生反应的化学方程式是______． ②B中浓H 2 SO 4 的作用是______． （4）写出D装置中反应的化学方程式______． （5）a中通入空气的作用______．
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