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合成氨工业对国民经济和社会发展具有重要的意义，合成氨气所需的氢气可以由水煤气分离得到．涉及反应信息如下： 反应①：C（s）+H 2 O（g） H 2 （g）+CO（g） 　 平衡常数K 1 反应②：平衡常数 K 2 = [ H 2 ]?[C O 2 ] [CO]?[ H 2 O] （1）K 1 的表达式：K 1 =______；反应②的化学方程式为______． （2）在恒容时，对反应①，不能判断该反应达到化学平衡状态的是______（填序号）． A．容器中压强不变 　       B．混合气体中CO浓度不变 C．υ（H 2 ） 正 =υ（H 2 O） 逆 D．c（H 2 O）=c（CO） （3）将一定量的H 2 O（g）和CO（g）分别通入到体积为1L的密闭容器中，在不同条件下进行反应，得到以下三组数据： 实验组别 温度/℃ 起始量/mol 平衡量/mol 达到平衡所需时间/min H 2 O CO H 2 CO 1 650 1 2 0.8 1.2 5 2 900 0.5 1 0.2 0.8 3 3 T a b c d t （Ⅰ）实验1中，用CO 2 表示反应开始到平衡的平均反应速率为______； （Ⅱ）在实验3，当a=0.5、b=1时，要使c、d数据与实验2相同，且t＜3，可以采取的措施为______（填序号） A．其它条件不变温度T＜900℃B．其它条件不变温度T＞900℃ C．充入一定量氖气              D．使用高效催化剂 （Ⅲ）对于反应②，当升高温度时K 2 ______（填“增大”、“减小”或“不变”）．
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