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煤化工中研究不同温度下平衡常数、投料比及热值等问题。 已知:CO(g)+H 2 O(g) H 2 (g)+CO 2 (g)平衡常数随温度的变化如下表: 温度/℃ 400 500 800 平衡常数K 9.94 9 1 试回答下列问题 ⑴上述正向反应是 反应(填“放热”或“吸热”)。 ⑵在800℃发生上述反应,以表中的物质的量投入恒容反应器,其中向正反应方向移动的有 (选填A、B、C、D、E)。 n(CO) n(H 2 O) n(H 2 ) n(CO 2 ) A 1 5 2 3 B 2 2 1 1 C 3 3 0 0 D 0.5 2 1 1 E 3 1 2 1 ⑶已知在一定温度下: C(s)+CO 2 (g) 2CO(g)平衡常数K; C(s)+H 2 O(g) CO(g)+H 2 (g) 平衡常数K 1 ; CO(g)+H 2 O(g) H 2 (g)+CO 2 (g)平衡常数K 2 ; 则K、K 1 、K 2 之间的关系是K= 。 ⑷若在500℃时进行,设起始时CO和H 2 O的起始浓度均为0.010mol/L,在该条件下,CO的平衡转化率为: 。 ⑸若反应在800℃进行,设起始时CO(g)和H 2 O(g)共为1mol,水蒸气的体积分数为x;平衡时CO转化率为y,则y随x变化的函数关系式为:y= 。
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