推荐回答（2个）
C 移走1.0 mol Pl3 和 0.50 mol Cl2相当于反应物的物质的量减少一半，如果是恒压的话，答案应该是0.2，可现在是恒积，则相当于在恒压的情况下在扩大体积，平衡向逆方向移动，所以应该小于0.2.
C
如果没算错的话大约是0.1196
用平衡常数不变可以算
K=[PCL5]/[PCL3][CL] 温度不变K恒定
也可以这样想 这个气体反应的反应物种类多于生成物而且是系数是1， 1 ，1也就是反应物的影响大于生成物 如果2个反应物浓度均减半的话 生成物浓度尚且将减得更多 何况在这个情况下反应物减量大于一半
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