19高考化学总复习第七章化学反应速率和化学平衡7_2_2考点二化学平衡的移动学后即练新人教版.doc

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17-2-2 考点二 化学平衡的移动1向一容积不变的密闭容器中充入 1 mol N2O4,建立了平衡 N2O4(g)2NO 2(g),测知 N2O4的转化率为 a%,在其他条件不变时再通入 1 mol N2O4,待重新建立新平衡时 N2O4的转化率为 b%。 a与 b的大小关系为( )A ab C a b D无法确定解析:答案:B2已知反应 O2(g)2Cl 2(g)2Cl 2O(g) H0。在三个恒温、恒容的密闭容器中分别充入 1 mol O2与 2 mol Cl2,测得平衡时 O2的转化率如下表。下列说法正确的是( )A.起始反应速率:B平衡时压强: p1p2C容器体积: V1,结合勒夏特列原理,平衡时压强也是 p1” “B,所以 A中二氧化硫的转化率大,即达到平衡时 B容器中 SO2的质量分数大于 A容器中 SO2的质量分数。答案:

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